0000950170-25-046351 | 10-K | XBRL Viewer

Redeemable Convertible Preferred Stock

As of December 31, 2024, the Company has no outstanding redeemable convertible preferred stock as all redeemable convertible preferred stock converted into common stock concurrently with the IPO in January 2024.

Redeemable convertible preferred stock consisted of the following as of December 31, 2023 (in thousands, except share amounts):


December 31, 2023	Authorized Shares		Shares Issued and Outstanding		Liquidation & Carrying Value		Common Stock Issuable Upon Conversion
Series A-1		5,075,000		5,075,000	$	3,570		1,252,438
Series B		11,973,000		11,973,000	$	10,000		3,508,584
Series C		73,598,283		73,598,283	$	22,000		7,718,740
Series D		53,271,754		53,271,754	$	47,300		5,586,959
Series E		112,422,700		112,422,700	$	120,000		11,790,523
Series F		81,587,937		81,587,937	$	105,020		8,556,669

Series F Redeemable Convertible Preferred Stock

In 2023, the Company entered into a securities purchase agreement (Series F Agreement) with certain investors to sell shares of Series F redeemable convertible preferred stock (Series F) at $1.2872 per share. In July 2023, the Company issued 81,587,937 shares of Series F redeemable convertible preferred stock to existing and new investors at $1.2872 per share for gross cash proceeds of $105.0 million, less issuance costs of $0.4 million, resulting in net proceeds of $104.6 million.

Rights, Preferences, Privileges and Restrictions

Voting Rights

Each preferred stockholder is entitled to cast the number of votes equal to the number of whole shares of common stock into which the shares of preferred stock held by such holder are convertible at the time of such vote. All preferred stockholders are entitled to vote on all matters upon which holders of common stock have the right to vote, other than matters that must by law be voted by class or series vote.

Conversion Rights

Each share of redeemable convertible preferred stock is convertible at the option of the holder at any time into a share of common stock. Each share of convertible preferred stock is convertible into that number of common shares as is determined by dividing the applicable Initial Purchase Price (the Initial Purchase Price) of such share by the applicable conversion price. The conversion rate is subject to adjustment upon the occurrence of certain events, including diluting issues of shares, stock splits, stock combinations, certain dividends and distributions, a merger and a reorganization. The conversion rates for each series of redeemable convertible preferred stock as of December 31, 2023 are as follows: Series A-1 1:4.05, Series B 1:3.412, and Series C, D, E, and F 1:9.535.

All shares of the redeemable convertible preferred stock shall automatically be converted into shares of common stock, based on the then-effective applicable conversion rate (i) upon the closing of the sale of shares of common stock to the public at a price of at least $1.33 per share (subject to appropriate adjustment in the event of any stock dividend, stock split, combination or other similar recapitalization with respect to the common stock), in a firm commitment underwritten public offering pursuant to an effective registration statement under the Securities Act of 1933, as amended, covering the offer and sale of common stock for the account of the Company (1) which results in at least $100.0 million of gross proceeds to the Company and (2) in which the pre-money valuation of the Company immediately prior to such public offering is at least $700.0 million or (ii) upon the written consent of the holders of at least 75% of the then-outstanding shares of convertible preferred stock voting together as a single class and not as separate series, and on an as-converted to common stock basis.

Dividend Rights

Holders of Series F Preferred Stock shall be entitled to receive, prior and in preference to any other class or series of capital stock, cumulative cash dividends, when, as and if declared by the Board, out of any funds that are legally available, at the rate of 8% of the Series F Initial Purchase Price of $1.2872 per annum on each outstanding share of Series F Preferred Stock, subject to adjustment for any stock dividends, combinations, splits, recapitalizations and the like with respect to such shares.

Following the issuance and distribution of dividends to holders of Series F Preferred Stock, holders of Series E Preferred Stock shall be entitled to receive, prior and in preference to the holders of Series D Preferred Stock and Series C Preferred Stock (together, the Senior Preferred Stock), Series B Preferred Stock, Series A-1 Preferred Stock and common stock, cumulative cash dividends, when, as and if declared by board of directors, out of any funds that are legally available, at the rate of 8% of the Series E Initial Purchase Price per annum on each outstanding share of Series E Preferred Stock, subject to adjustment for any stock dividends, combinations, splits, recapitalizations and the like with respect to such shares.

Following the issuance and distribution of dividends to holders of Series F Preferred Stock and Series E Preferred Stock, holders of Series D Preferred Stock and Series C Preferred Stock (together, the Senior Preferred Stock) shall be entitled to receive, on a pari passu basis and prior and in preference to the holders of Series B Preferred Stock, Series A-1 Preferred Stock and common stock, cumulative cash dividends, when, as and if declared by the Board, out of any funds that are legally available, at the rate of (i) with respect to the Series E Preferred Stock, 8% of the Series E Initial Purchase Price per annum on each outstanding share of Series E Preferred Stock, subject to adjustment for any stock dividends, combinations, splits, recapitalizations and the like with respect to such shares (ii) with respect to the Series D Preferred Stock, 8% of the Series D Initial Purchase Price per annum on each outstanding share of Series D Preferred Stock, subject to adjustment for any stock dividends, combinations, splits, recapitalizations and the like with respect to such shares and (iii) with respect to the Series C Preferred Stock, 8% of the Series C Initial Purchase Price per annum on each outstanding share of Series C Preferred Stock, subject to adjustment for any stock dividends, combinations, splits, recapitalizations and the like with respect to such shares.

Following the issuance and distribution of dividends to holders of Series F Preferred Stock, Series E Preferred Stock and Senior Preferred Stock, holders of Series B Preferred Stock and Series A-1 Preferred Stock shall be entitled to receive, on a pari passu basis and prior and in preference to the holders of common stock, noncumulative cash dividends, when, as and if declared by the Board of Directors, out of any funds that are legally available, at the rate of (i) with respect to the Series B Preferred Stock, 8% of the Series B Initial Purchase Price per annum on each outstanding share of Series B Preferred Stock, subject to adjustment for any stock dividends, combinations, splits, recapitalizations and the like with respect to such shares and (ii) with respect to the Series Preferred Stock, 8% of the Series Initial Purchase Price per annum on each outstanding share of Series Preferred Stock, subject to adjustment for any stock dividends, combinations, splits, recapitalizations and the like with respect to such shares.

No distributions shall be made with respect to the common stock unless dividends on the redeemable convertible preferred stock have been declared and all declared dividends on the redeemable convertible preferred stock have been paid or set aside for payment to the redeemable convertible preferred stockholders. The right to receive dividends on shares of Series B Preferred Stock and Series A-1 Preferred Stock shall not be cumulative, and no right to dividends shall accrue to holders of Series B Preferred Stock and Series A-1 Preferred Stock by reason of the fact that dividends on said shares are not declared or paid. Payment of any dividends to the holders of Series B Preferred Stock and Series A-1 Preferred Stock shall be on a pro rata, pari passu basis in proportion to the dividend rate for the Series B Preferred Stock and Series A-1 Preferred Stock, as applicable.

After payment of the full amount of any dividends to holders of redeemable convertible preferred stock, any additional dividends shall be distributed among all holders of common stock and all holders of redeemable convertible preferred stock in proportion to the number of shares of common stock which would be held by each such holder if all such shares of redeemable convertible preferred stock were converted to common stock at the then-effective applicable conversion rate. The Company has not declared or paid any dividends for the years ended December 31, 2024 and 2023.

Liquidation Preference

In the event of any voluntary or involuntary liquidation, dissolution or winding-up of the Company, or a deemed liquidation event of the Company (which includes certain mergers, acquisitions, and asset transfers), before any distribution or payment shall be made to the holders of common stock:


	(i)	The holders of Series F Preferred Stock shall be entitled to be paid out of the assets of the Company, prior and in preference to any distribution of the proceeds of such liquidation, dissolution or winding up to the holders of Series E Preferred Stock, Senior Preferred Stock, Series B Preferred Stock, Series A-1 Preferred Stock or common stock, an amount per share of Series F Preferred Stock equal to the Series F Initial Purchase Price, plus all declared but unpaid dividends on the Series E Preferred Stock, for each share of Series F Preferred Stock then held.


	(ii)	Following the distribution pursuant to holders of Series F Preferred Stock, the holders of Series E Preferred Stock shall be entitled to be paid out of the assets of the Company, prior and in preference to any distribution of the proceeds of such liquidation, dissolution or winding up to the holders of Senior


		Preferred Stock, Series B Preferred Stock, Series A-1 Preferred Stock or common stock, an amount per share of Series E Preferred Stock equal to the Series E Initial Purchase Price, plus all declared but unpaid dividends on the Series E Preferred Stock, for each share of Series E Preferred Stock then held.


	(iii)	Following the distribution pursuant to holders of Series F Preferred Stock and Series E Preferred Stock, the holders of each series of Senior Preferred Stock shall be entitled to be paid out of the assets of the Company, on a pari passu basis and prior and in preference to any distribution of the proceeds of such liquidation, dissolution or winding up to the holders of Series B Preferred Stock, Series A-1 Preferred Stock or common stock, (i) with respect to the Series D Preferred Stock, an amount per share of Series D Preferred Stock equal to the Series D Initial Purchase Price, plus all declared but unpaid dividends on the Series D Preferred Stock, for each share of Series D Preferred Stock then held and (ii) with respect to the Series C Preferred Stock, an amount per share of Series C Preferred Stock equal to the Series C Initial Purchase Price, plus all declared but unpaid dividends on the Series C Preferred Stock, for each share of Series C Preferred Stock then held


	(iv)	Following the distributions pursuant to holders of Series F Preferred Stock, Series E Preferred Stock and Senior Preferred Stock, the holders of Series B Preferred Stock and Series A-1 Preferred Stock shall be entitled to be paid out of the assets of this Corporation, on a pari passu basis (i) with respect to the Series B Preferred Stock, an amount per share of Series B Preferred Stock equal to the Series B Initial Purchase Price, plus all declared but unpaid dividends on the Series B Preferred Stock, for each share of Series B Preferred Stock then held; and (ii) with respect to the Series A-1 Preferred Stock, an amount per share of Series A-1 Preferred Stock equal to the Series A-1 Initial Purchase Price, plus all declared but unpaid dividends on the Series A-1 Preferred Stock, for each share of Series A-1 Preferred Stock then held by them.


	(v)	If, upon any such liquidation, dissolution or winding up, the assets of the Company shall be insufficient to make payment in full of the liquidation preferences described in (i), (ii), (iii) and (iv) above, then such assets shall be distributed in the following order of priority: (a) to the holders of Series F Preferred Stock in preference and ratably in proportion to the full amounts to which they would otherwise be respectively entitled pursuant to in (i) above, (b) any remaining assets then to the holders of Series E Preferred Stock in preference and ratably in proportion to the full amounts to which they would otherwise be respectively entitled pursuant to (ii) above, (c) any remaining assets then to the holders of each series of Senior Preferred Stock in preference and ratably in proportion to the full amounts to which they would otherwise be respectively entitled pursuant to (iii) above, and (d) any remaining assets then to the holders of Series B Preferred Stock and Series A-1 Preferred Stock ratably in proportion to the full amounts to which they would otherwise be respectively entitled pursuant to (iv) above.

After the payment of the full liquidation preferences as set out above, the remaining assets of the Company legally available for distribution, if any, shall be distributed ratably to the holders of the common stock, Series F Preferred Stock on an as-converted to common stock basis, Series E Preferred Stock on an as-converted to common stock basis, Senior Preferred Stock on an as-converted to common stock basis and Series A-1 Preferred Stock on an as-converted to common stock basis; provided, however, that if the aggregate amount which a holder of a share of Series A-1 Preferred Stock is entitled to receive exceeds the sum of three times the Series A-1 Initial Purchase Price plus declared but unpaid dividends thereon, such holder of Series A-1 Preferred Stock shall cease participating in such distribution as to such Series A-1 Preferred Stock, and the balance shall be distributed ratably to the holders of common stock, Series F Preferred Stock on an as-converted to common stock basis, Series E Preferred Stock on an as-converted to common stock basis and Senior Preferred Stock on an as-converted to common stock basis.

Redemption Rights

At any time, following July 28, 2028, Convertible Preferred Shares are redeemable as follows:


	(i)	If requested in writing by holders of a majority of the then-outstanding shares of Series A-1 redeemable convertible preferred stock, all of the outstanding Series A-1 redeemable convertible preferred stock shall


		be redeemed by paying in cash in exchange for the shares of Series A-1 redeemable convertible preferred stock to be redeemed an amount equal to the Series A-1 Initial Purchase Price per share of Series A-1 redeemable convertible preferred stock (as adjusted for any stock dividends, combinations, splits, recapitalizations and the like with respect to such shares), plus any and all declared but unpaid dividends with respect to such shares of Series A-1 redeemable convertible preferred stock


	(ii)	If requested in writing by holders of a majority of the then-outstanding shares of Series B redeemable convertible preferred stock, all of the outstanding Series B Preferred Stock shall be redeemed by paying in cash in exchange for the shares of Series B redeemable convertible preferred stock to be redeemed an amount equal to the Series B Initial Purchase Price per share of Series B redeemable convertible preferred stock (as adjusted for any stock dividends, combinations, splits, recapitalizations and the like with respect to such shares), plus any and all declared but unpaid dividends with respect to such shares of Series B redeemable convertible preferred stock.


	(iii)	If requested in writing by holders of 66.67% of the then-outstanding shares of Series C redeemable convertible preferred stock and to the extent affirmatively elected by a holder not to redeem, shares of the outstanding Series C redeemable convertible preferred stock shall be redeemed by paying in cash in exchange for the shares of Series C redeemable convertible preferred stock to be redeemed an amount equal to the Series C Initial Purchase Price per share of Series C redeemable convertible preferred stock (as adjusted for any stock dividends, combinations, splits, recapitalizations and the like with respect to such shares), plus any and all declared but unpaid dividends with respect to such shares of Series C redeemable convertible preferred stock.


	(iv)	If requested in writing by holders of a majority of the then-outstanding shares of Series D redeemable convertible preferred stock and to the extent affirmatively elected by a holder not to redeem, shares of the outstanding Series D redeemable convertible preferred stock shall be redeemed by paying in cash in exchange for the shares of Series D redeemable convertible preferred stock to be redeemed an amount equal to the Series D Initial Purchase Price per share of Series D redeemable convertible preferred stock (as adjusted for any stock dividends, combinations, splits, recapitalizations and the like with respect to such shares), plus any and all declared but unpaid dividends with respect to such shares of Series D redeemable convertible preferred stock.


	(v)	If requested in writing by holders of a majority of the then-outstanding shares of Series E redeemable convertible preferred stock and to the extent affirmatively elected by a holder not to redeem, all of the outstanding Series E Preferred Stock shall be redeemed by paying in cash in exchange for the shares of Series E Preferred Stock to be redeemed (other than those holders of Series E Preferred Stock that affirmatively choose to not participate in such redemption) an amount equal to: the Series E Initial Purchase Price per share of Series E Preferred Stock (as adjusted for any stock dividends, combinations, splits, recapitalizations and the like with respect to such shares), plus any and all declared but unpaid dividends with respect to such shares of Series E Preferred Stock.


	(vi)	If requested in writing by holders of a majority of the then-outstanding shares of Series F redeemable convertible preferred stock and to the extent affirmatively elected by a holder not to redeem, all of the outstanding Series F Preferred Stock shall be redeemed by paying in cash in exchange for the shares of Series F Preferred Stock to be redeemed (other than those holders of Series F Preferred Stock that affirmatively choose to not participate in such redemption) an amount equal to: the Series F Initial Purchase Price per share of Series F Preferred Stock (as adjusted for any stock dividends, combinations, splits, recapitalizations and the like with respect to such shares), plus any and all declared but unpaid dividends with respect to such shares of Series F Preferred Stock.

Fair Value Measurements - Summary of Financial Instruments Carried at Fair Value on Recurring Basis (Details) - Fair Value, Recurring - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Success Fee Liability
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities		$ 365
Cash Equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	$ 256,204	8,240
Marketable Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	484,930	179,408
Level 1 \| Cash Equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	256,204	8,240
Level 2 \| Marketable Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	$ 484,930	179,408
Level 3 \| Success Fee Liability
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities		$ 365

Common Stock (Tables)

12 Months Ended

Dec. 31, 2024

Schedule of Common Stock Reserved for Issuance Upon Conversion

As of December 31, 2024, the Company reserved the following shares of common stock for issuance upon conversion of the outstanding redeemable convertible preferred stock and exercise of stock options:


	December 31,
	2024
Stock options outstanding		6,574,580
Reserved for future stock option issuances		6,222,990
Reserved for future ESPP issuances		783,096
Total		13,580,666

Net Loss Per Share Attributable to Common Stockholders (Tables)

12 Months Ended

Dec. 31, 2024

Earnings Per Share [Abstract]

Schedule of Basic and Diluted Net Loss Per Share

Basic and diluted net loss per share was calculated as follows (in thousands, except share and per share amounts):


	Year Ended December 31,
	2024			2023
Numerator:
Net loss and comprehensive loss	$	(88,039	)	$	(48,607	)
Deemed dividend on redeemable convertible preferred stock issuances		—			(410	)
Cumulative redeemable convertible preferred stock dividends		—			(18,781	)
Net loss attributable to common stockholders	$	(88,039	)	$	(67,798	)
Denominator:
Weighted-average common shares outstanding, basic and diluted		62,496,725			4,330,933
Net loss per share attributable to common stockholders, basic and diluted	$	(1.41	)	$	(15.65	)

Schedule of Antidilutive Securities Excluded from Computation of Diluted Net Loss Per Share Attributable to Common Stockholders

The Company excluded the following from the computation of diluted net loss per share attributable to common stockholders for the years ended December 31, 2024 and 2023 because including them would have had an anti-dilutive effect:


	December 31,
	2024		2023
Conversion of redeemable convertible preferred stock		-		38,413,913
Stock options outstanding		6,574,580		5,532,871
Total		6,574,580		43,946,784

Summary of Significant Accounting Policies (Policies)	12 Months Ended
Summary of Significant Accounting Policies (Policies)	Dec. 31, 2024
Accounting Policies [Abstract]
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates, assumptions, and judgments that affect the reported amounts of assets, liabilities, expenses, and related disclosures in the accompanying notes. The Company bases its estimates, assumptions and judgments on historical experience when available and on various factors that it believes to be reasonable under the circumstances as of the date of the accompanying consolidated financial statements including stock-based compensation expense, accrued research and development expenses, lease accounting, and the recoverability of the Company’s net deferred tax assets and related valuation allowance. In addition, other factors may affect estimates, including the expected business and operational changes, the sensitivity and volatility associated with the assumptions used in developing estimates, and whether historical trends are expected to be representative of future trends. Actual results could differ materially from the estimates and assumptions used in the preparation of the accompanying consolidated financial statements under different assumptions or conditions.
Cash, Cash Equivalents and Marketable Securities	Cash, Cash Equivalents and Marketable Securities The Company considers all highly liquid investments and instruments with original maturities of 90 days or less that can be liquidated without prior notice or penalty to be cash equivalents. Cash equivalents consisted primarily of demand deposit accounts, insurance deposits and short-term U.S. Treasury money market funds as of December 31, 2024 and 2023. Marketable securities represent fixed income securities which consists of U.S. Treasury bills with maturities greater than 90 days.
Concentration of Credit Risks	Concentration of Credit Risks Financial instruments that subject the Company to significant concentrations of credit risk consist primarily of cash and cash equivalents. The Company deposits cash and cash equivalents with high credit quality financial institutions in the United States. These deposits are held in checking and money market accounts and may, from time to time, exceed the federally insured amounts. The Company has not experienced any losses in such accounts. The Company believes it is not exposed to any significant risk in its cash and cash equivalents. The primary objectives of the Company’s investment portfolio are the preservation of capital and maintenance of liquidity. The Company is subject to risks common to companies in the biopharmaceutical industry, including, but not limited to, risks related to the successful development and commercialization of product candidates, fluctuations in operating results and financial risks, the ability to successfully raise additional funds when needed, protection of proprietary rights and patent risks, patent litigation, compliance with government regulations, dependence on key personnel and collaboration partners, and competition from competing products in the marketplace.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The Company applies fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. The Company’s financial instruments consist principally of cash, cash equivalents, marketable securities, accounts payable and operating lease liabilities. Fair value is measured as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. A fair value measurement assumes that the transaction to sell the asset or transfer the liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market. A framework is used for measuring fair value utilizing a three-tier hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). The three levels of the fair value hierarchy are as follows: Level 1—Observable inputs such as unadjusted quoted prices in active markets that are accessible at the measurement date for identical unrestricted assets or liabilities the Company has the ability to access; Level 2—Inputs (other than quoted prices included within Level 1) that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the asset or liability. These include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active; and Level 3—Unobservable inputs that are significant to the fair value measurement and reflect the reporting entity’s use of significant management judgment and assumptions when there is little or no market data. Level 3 assets and liabilities include those whose fair value measurements are determined using pricing models, discounted cash flow methodologies or similar valuation techniques and significant management judgment or estimation. Financial instruments are categorized in their entirety based on the lowest level of input that is significant to the fair value measurement. The assessment of the significance of a particular input to the fair value measurement requires judgment and considers factors specific to the investment. To the extent that the valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for instruments categorized in Level 3. The Company reviews the fair value hierarchy classification at each reporting date. Changes in the ability to observe valuation inputs may result in a reclassification of levels for certain assets or liabilities within the fair value hierarchy. The Company did not have any transfers of assets and liabilities between the levels of the fair value measurement hierarchy during the years presented.
Comprehensive Loss	Comprehensive Loss There were no differences between net loss and comprehensive loss presented in the statements of operations for the years ended December 31, 2024 and 2023
Property and Equipment, Net	Property and Equipment, Net Property and equipment are stated at cost, less accumulated depreciation. Depreciation is calculated over five years, which equals the estimated useful lives of the respective assets. The initial cost of property and equipment consists of its purchase price and any directly attributable costs of bringing the asset to its working condition and location for its intended use. Expenditures incurred after the assets have been put into operation, such as repairs and maintenance, are charged to expense in the period in which the costs are incurred. Major replacements, improvements, and additions are capitalized in accordance with Company policy.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets The Company evaluates its long-lived assets, which consist of property and equipment and operating lease right-of-use assets, for impairment at least annually and whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable. Factors that the Company considers in deciding when to perform an impairment review include significant underperformance of the business in relation to expectations, significant negative industry or economic trends, and significant changes or planned changes in the use of the assets. If the asset is considered to be impaired, the amount of any impairment is measured as the difference between the carrying value and the fair value of the impaired asset. The Company recognized no impairment losses for the years ended December 31, 2024 and 2023.
Deferred Offering Costs	Deferred Offering Costs The Company capitalizes as deferred offering costs all direct and incremental legal, professional, accounting and other third-party fees incurred in connection with the Company’s IPO. The deferred offering costs was offset against the IPO proceeds upon the consummation of an offering. As of December 31, 2024 and 2023, respectively, the Company had zero and $4.7 million in deferred offering costs, of which $0.2 million were in accounts payable and $1.0 million were in accrued expenses
Leases	Leases Lease right-of-use assets represent the Company’s right to use an underlying asset for the lease term, and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. Operating lease right-of-use assets and liabilities are recognized when the Company takes possession of the leased property (the Commencement Date) based on the present value of lease payments over the lease term. At the inception of a contract, the Company determines whether the arrangement is or contains a lease based on the facts and circumstances present. The Company had no finance leases as of December 31, 2024 and 2023. Operating lease right-of-use assets also include any lease payments made at or before lease commencement and exclude any lease incentives received. The lease terms used to calculate the right-of-use asset and related lease liability include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. The Company elects the practical expedient to exclude short-term agreements of less than 12 months from capitalization. The Company enters into various operating leases for office space. The leases expire at various dates, have various options to renew, and may contain escalation provisions. Rent expense on cancelable leases containing known future scheduled rent increases is recorded on a straight-line basis over the term of the respective leases beginning on the Commencement Date. The difference between rent expense and rent paid is accounted for as a component of operating lease right-of-use assets on the accompanying balance sheets. Landlord improvement allowances and other such lease incentives are recorded as property and equipment and as a reduction of the right-of-use leased assets and are amortized on a straight-line basis as a reduction to operating lease costs. The key estimates for the Company’s leases include the incremental borrowing rate used to determine the present value of lease payments and the lease term. The Company’s leases generally do not include an implicit rate. Management determines the incremental borrowing rate based on the information available at lease commencement. Operating lease right-of-use assets are initially measured at cost, which comprises the initial amount of the lease liability adjusted for lease payments made at or before the lease commencement date, plus any initial direct costs incurred less any lease incentives received. Operating lease right-of-use assets are subsequently measured throughout the lease term at the carrying amount of the lease liability, plus initial direct costs, plus (minus) any prepaid (accrued) lease payments, less the unamortized balance of lease incentives received. Lease expense for lease payments is recognized on a straight-line basis over the lease term. Operating lease liabilities are initially measured at the present value of the unpaid lease payments at the lease commencement date.
Revenue Recognition	Revenue Recognition The Company entered into development and license agreements with Lepu Biotech Co., Ltd. (Lepu) and Kissei Pharmaceutical Co., Ltd. (Kissei), collectively referred to as the License and Collaboration Agreements. See Note 6 for a description of the License and Collaboration Agreements. At contract inception, the Company analyzes its collaboration arrangements to assess whether such arrangements involve joint operating activities performed by parties that are both active participants in the activities and exposed to significant risks and rewards dependent on the commercial success of such activities and therefore within the scope of ASC 808, Collaborative Arrangements (ASC 808). This assessment is performed throughout the life of the arrangement based on changes in the responsibilities of all parties in the arrangement. For collaboration arrangements within the scope of ASC 808 that contain multiple units of account, the Company first determines which components of the collaboration are deemed to be within the scope of ASC 808 and which components of the collaboration are more reflective of a vendor-customer relationship and therefore within the scope of ASC 606, Revenue Recognition (ASC 606). For units of account of collaboration arrangements that are accounted for pursuant to ASC 808, an appropriate recognition method is determined and applied consistently, either by analogy to authoritative accounting literature or by applying a reasonable and rational policy election. The Company evaluates the income statement classification for presentation of amounts due from or owed to other participants associated with multiple activities in a collaboration arrangement based on the nature of each separate activity. For units of account accounted within scope of ASC 606, to determine the appropriate amount of revenue to be recognized for the arrangements, the Company performs the following steps: (i) identification of the promised goods or services in the contract; (ii) determination of whether the promised goods or services are performance obligations including whether they are distinct in the context of the contract; (iii) measurement of the transaction price, including the constraint on variable consideration; (iv) allocation of the transaction price to the performance obligations; and (v) recognition of revenue when (or as) the Company satisfies each performance obligation. The Company’s performance obligations under the terms of these agreements include a license grant, research and development services or customer options, depending on the terms of the License and Collaboration Agreement. Payments to the Company include a non-refundable upfront payment, payments based upon the achievement of development and commercial milestones, and royalties on product sales under the License and Collaboration agreements. Development milestones The License and Collaboration Agreements include milestone payments that are triggered by the achievement of development milestones. These milestone payments represent variable consideration that are not initially recognized within the transaction price. Revenue from milestones will be recognized at the time the specified milestone events have been achieved. Sales milestones and royalty payments The License and Collaboration Agreements also include certain sales-based milestone and royalty payments upon successful commercialization of a licensed product. In accordance with ASC 606, the Company recognizes revenue from sales-based milestone and royalty payments at the later of: (i) the occurrence of the subsequent sale; or (ii) the performance obligation to which some or all of the sales-based milestone or royalty payments has been allocated or has been satisfied. The Company anticipates recognizing these milestones and royalty payments if and when subsequent sales are generated.
Research and Development Expenses	Research and Development Expenses Research and development (R&D) expenses consist of costs incurred for R&D of its product candidate and are recorded to operating expenses when incurred. The Company’s R&D expenses consist primarily of costs incurred in performing R&D activities, including personnel-related expenses such as salaries, stock-based compensation and benefits, as well as allocated facilities costs, dues and subscriptions and external costs of outside vendors engaged as contract research organization (CRO), contract manufacturers, consultants and other third parties to conduct and support our clinical trials and preclinical studies. The Company accrues expenses related to development activities performed by third parties based on an evaluation of services received and efforts expended pursuant to the terms of the contractual arrangements. Payments under some of these contracts depend on clinical trial milestones. There may be instances in which payments made to the Company’s vendors will exceed the level of services provided and result in a prepayment of expenses. In accruing service fees, the Company estimates the time period over which services will be performed and the level of effort to be expended in each period. If the actual timing of the performance of services or the level of effort varies from the estimate, the Company will adjust the accrual or prepaid expense accordingly. Costs to acquire technologies to be used in R&D that have not reached technological feasibility and have no alternative future use are also expensed as incurred.
Stock-Based Compensation	Stock-Based Compensation The Company periodically grants equity-based payment awards in the form of stock options to employees, directors and non-employees and records stock-based compensation expenses for awards of stock-based payments based on their estimated fair value at the grant date. The Company recognizes stock-based compensation expense for all equity-based payments, including stock options. Stock-based compensation costs are calculated based on the estimated fair value of the underlying option using the Black-Scholes option pricing model on the date of grant for stock options and are recognized as expense in the accompanying statement of operations and comprehensive loss on a straight-line basis over the requisite service period, which is the vesting period. Determining the appropriate fair value model and related input assumptions requires judgment, including estimating the fair value of the Company’s common stock, stock price volatility, and expected term. For any performance-based awards, the Company assesses the probability of the likelihood of achievement and recognizes the related expense accordingly. The Company recognizes forfeitures related to stock-based compensation awards as they occur. The Company classifies stock-based compensation expense in the statement of operations in the same manner in which the award recipients’ payroll costs are classified or in which the award recipients’ service payments are classified.
Income Taxes	Income Taxes The Company accounts for income taxes in accordance with ASC 740, Income Taxes (ASC 740). ASC 740 requires the use of the asset and liability method of accounting for income taxes. The current or deferred tax consequences of a transaction are measured by applying the provisions of enacted tax laws to determine the amount of taxes payable currently or in future years. Deferred tax assets and liabilities are determined based on the difference between the financial statements and tax basis of assets and liabilities and expected future tax consequences of events that have been included in the consolidated financial statements or tax returns using enacted tax rates in effect for the year in which the differences are expected to reverse. Under this method, a valuation allowance is used to offset deferred tax assets if, based upon the available evidence, it is more likely than not that some or all of the deferred tax assets may not be realized. Management annually evaluates the recoverability of deferred taxes and the adequacy of the valuation allowance. See Note 12 for additional information. The Company follows the provisions of ASC 740 relative to accounting for uncertain tax positions. These provisions provide guidance on the recognition, de-recognition and measurement of potential tax benefits associated with tax positions. For those benefits to be recognized, a tax position must be more likely than not to be sustained upon examination by taxing authorities. As applicable, the Company recognizes accrued penalties and interest related to unrecognized tax benefits in the provision for income taxes. Significant judgment is required in determining the Company’s provision for income taxes, deferred tax assets and liabilities and the valuation allowance recorded against net deferred tax assets. The Company assesses the likelihood that deferred tax assets will be recovered as deductions from future taxable income. The evaluation of the need for a valuation allowance is performed on a jurisdiction-by-jurisdiction basis and includes a review of all available positive and negative evidence. Factors reviewed include projections of pre-tax book income for the foreseeable future, determination of cumulative pre-tax book income after permanent differences, earnings history and reliability of forecasting. The Company is required to file federal and state income tax returns in the U.S. The preparation of state tax returns requires the Company to interpret the applicable tax laws and regulations in effect in such jurisdictions, which could affect the amount of tax paid by the Company. The Company’s income tax returns are based on calculations and assumptions that are subject to examination by the IRS and other tax authorities. In addition, the calculation of the Company’s tax liabilities involves dealing with uncertainties in the application of complex tax regulations. The Company recognizes liabilities for uncertain tax positions based on a two-step process. The first step is to evaluate the tax position for recognition by determining if the weight of available evidence indicates that it is more likely than not that the position will be sustained on audit, including resolution of related appeals or litigation processes, if any. The second step is to measure the tax benefit as the largest amount that is more than 50% likely of being realized upon settlement. While the Company believes it has appropriate support for the positions taken on its tax returns, the Company regularly assesses the potential outcomes of examinations by tax authorities in determining the adequacy of its provision for income taxes. The Company continually assesses the likelihood and amount of potential revisions and adjusts the income tax provision, income taxes payable and deferred taxes in the period in which the facts that give rise to a revision become known. The Company follows the accounting guidance on accounting for uncertainty in income taxes. The guidance prescribes a recognition threshold and measurement attribute criteria for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return.
Classification of Redeemable Convertible Preferred Stock	Classification of Redeemable Convertible Preferred Stock Classification of the Company’s Series A-1, B, C, D, E and F redeemable convertible preferred stock is being treated as mezzanine equity and not as part of stockholders’ deficit because the holders of such shares have liquidation rights in the event of a deemed liquidation that, in certain situations, are not solely within the control of the Company and would require the redemption of the then-outstanding redeemable convertible preferred stock. In addition, all of the Company’s redeemable convertible preferred stock are redeemable with the passage of time on or after July 28, 2028, by class and if requested by a requisite majority of each class. See Note 7 for additional information, including the conversion of all redeemable convertible preferred stock as of December 31, 2024. The carrying values of the Series A-1, B, C, D, E and F redeemable convertible preferred stock are reported at their respective redemption values.
Net Loss Per Share Attributable to Common Stockholders	Net Loss Per Share Attributable to Common Stockholders The Company determined all of its redeemable convertible preferred stock qualifies as participating securities, as defined in ASC 260, Earnings per Share (ASC 260) earnings with common stock. In accordance with ASC 260, a company is required to use the two-class method when computing net income (loss) per share when a company has securities that qualify as participating securities. The two-class method is an earnings allocation formula that determines net income (loss) per share for each class of common stock and participating security according to dividends declared (or accumulated) and participation rights in undistributed earnings. Under the two-class method, the net loss attributable to common stockholders is not allocated to the convertible preferred stock as the preferred stockholders do not have a contractual obligation to share in the Company’s losses.
Segment and Geographic Information	Segment and Geographic Information Operating segments are defined as components of an enterprise (business activity from which it earns revenue and incurs expenses) about which discrete financial information is available and regularly reviewed by the chief operating decision maker in deciding how to allocate resources and in assessing performance. The Company’s chief operating decision maker is its Chief Executive Officer. The chief operating decision maker reviews consolidated operating results to make decisions about allocating resources and assessing performance for the entire company. The Company views its operations and manages its business as one operating segment. All of the Company’s assets are located in the United States. See Note 7 for additional information.
Recently Issued Accounting Standards	Recently Issued Accounting Standards Accounting standards not listed below were assessed and determined not to be applicable or are expected to have minimal impact on the Company’s consolidated financial statements. In November 2023, the FASB issued Accounting Standards Update 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures (ASU 2023-07). The guidance includes the requirements that a public entity disclose, on an annual and interim basis, significant segment expenses that are regularly provided to the chief operating decision maker and included within each reported measure of segment profit or loss, the title and position of the chief operating decision maker, and an explanation of how the chief operating decision maker uses the reported measure(s) of segment profit or loss in assessing segment performance and deciding how to allocate resources. The guidance also requires that a public entity that has a single reportable segment provide all the disclosures required by the guidance and all existing segment disclosures in ASC 280, Segment Reporting. The guidance is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The Company adopted this standard for the year ended December 31, 2024 and applied the amendments retrospectively to all periods presented in the consolidated financial statements. See our segments disclosure in Note 7 for further detail. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. The guidance includes the requirement that public business entities, on an annual basis, disclose specific categories in the rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold (if the effect of those reconciling items is equal to or greater than 5% of the amount computed by multiplying pretax income (or loss) by the applicable statutory income tax rate). It also requires that all entities disclose, on an annual basis, the amount of income taxes paid (net of refunds received) disaggregated by federal (national), state, and foreign taxes and the amount of income taxes paid (net of refunds received) disaggregated by individual jurisdictions in which income taxes paid (net of refunds received) is equal to or greater than 5% of total income taxes paid (net of refunds received) and requires that all entities disclose income (or loss) from continuing operations before income tax expense (or benefit) disaggregated between domestic and foreign and income tax expense (or benefit) from continuing operations disaggregated by federal (national), state, and foreign. Lastly, the guidance eliminates the requirement for all entities to disclose the nature and estimate of the range of the reasonably possible change in the unrecognized tax benefits balance in the next 12 months or make a statement that an estimate of the range cannot be made. For public business entities, the guidance is effective for annual periods beginning after December 15, 2024. Early adoption is permitted for annual financial statements that have not yet been issued or made available for issuance. The guidance should be applied on a prospective basis. Retrospective application is permitted. The Company is currently evaluating the impact that this guidance may have on its consolidated financial statements. In November 2024, the FASB issued ASU No. 2024-03, Comprehensive Income - Expense Disaggregation Disclosures , which will improve the disclosures about a public business entity's expenses and address requests from investors for more detailed information about the types of expenses in commonly presented expense captions such as cost of sales, selling, general and administrative, and research and development. The amendments are effective for fiscal years beginning after December 15, 2026. Early adoption is permitted for annual financial statements that have not yet been issued or made available. The amendments should be applied on either (1) prospectively to financial statements issued for reporting periods after the effective date or (2) retrospectively to any or all prior periods presented in the financial statements. The Company is currently evaluating the provisions of the amendments and the effect on its future consolidated financial statements.

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2024

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation

A reconciliation of the expected income tax benefit computed using the federal statutory income tax rate to the Company’s effective income tax rate was as follows for the years ended December 31, 2024 and 2023:


	Year Ended December 31,
	2024			2023
Income tax computed at federal statutory rate		21.00	%		21.00	%
State taxes, net of federal benefit	(0.00)			(0.00)
Permanent differences		(0.62	)		(0.64	)
Stock-based compensation		6.18			(0.20	)
Research and development credit		2.64			2.97
Other		0.27			0.59
Valuation allowance		(29.47	)		(23.72	)
Effective income tax rate		0.00	%		(0.00	%)

Schedule of Deferred Tax Assets and Liabilities

The Company’s deferred tax assets as of December 31, 2024 and 2023, consisted of the following (in thousands):


	Year Ended December 31,
	2024			2023
Deferred tax assets:
Net operating losses	$	34,612		$	18,015
R&D credit		6,946			4,756
Foreign tax credit		425			424
Operating lease liabilities		50			97
Section 174		12,536			6,998
Other		1,884			266
Total gross deferred tax assets		56,453			30,556
Deferred tax liabilities:
Operating lease right-of-use assets		(46	)		(89	)
Other		(5	)		(10	)
Total gross deferred tax liabilities		(51	)		(99	)
Net deferred tax assets		56,402			30,457
Valuation allowance		(56,402	)		(30,457	)
Net deferred tax asset	$	—		$	—

Schedule of Reconciliation of Unrecognized Tax Benefits

The following reconciliation of the beginning and ending amount of gross unrecognized tax benefits, excluding interest and penalties, is as follows (in thousands):


	Year Ended December 31,
	2024			2023

Beginning balance of unrecognized tax benefits	$	1,000		$	691
Additions for prior year tax positions		(12	)		53
Additions for current year tax positions		409			256
Ending balance of unrecognized tax benefits	$	1,397		$	1,000

Redeemable Convertible Preferred Stock - Additional Information (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jul. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Class of Stock [Line Items]
Voting rights		Each preferred stockholder is entitled to cast the number of votes equal to the number of whole shares of common stock into which the shares of preferred stock held by such holder are convertible at the time of such vote. All preferred stockholders are entitled to vote on all matters upon which holders of common stock have the right to vote, other than matters that must by law be voted by class or series vote.
Preferred Stock, Convertible, Conversion Price		$ 1.33
Minimum gross proceeds on sale of shares issuable on conversion		$ 100,000,000
Proceeds from initial public offering, net of issuance costs		$ 406,410,000
Percentage of written consent		75.00%
Dividend declared		$ 0	$ 0
Dividend paid		0	$ 0
Minimum
Class of Stock [Line Items]
Proceeds from initial public offering, net of issuance costs		$ 700,000,000
Redeemable Preferred Stock
Class of Stock [Line Items]
Outstanding redeemable convertible preferred stock		0
Distributions made		$ 0
Series F Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Sale of stock, price per share	$ 1.2872		$ 1.2872
Number of redeemable convertible preferred stock issued			81,587,937
Gross proceeds from sale of shares	$ 105,000,000
Stock Issuance Costs	400,000
Net proceeds from sale of shares	$ 104,600,000
Series F Preferred Stock
Class of Stock [Line Items]
Percentage of cumulative cash dividend		8.00%
Purchase price per share		$ 1.2872
Series E Preferred Stock
Class of Stock [Line Items]
Dividend distribution percentage		8.00%
Series D Preferred Stock
Class of Stock [Line Items]
Dividend distribution percentage		8.00%
Series C Preferred Stock
Class of Stock [Line Items]
Dividend distribution percentage		8.00%
Series B Preferred Stock
Class of Stock [Line Items]
Dividend distribution percentage		8.00%
Series Preferred Stock
Class of Stock [Line Items]
Dividend distribution percentage		8.00%
Series C Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Shares outstanding percentage		66.67%

Stock-Based Compensation - Summary of Stock Option Activity (Details) - Stock Options - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of Outstanding Options, Beginning Balance	5,532,871
Number of Outstanding Options, Granted	2,310,258
Number of Outstanding Options, Exercised	(989,445)
Number of Outstanding Options, Forfeited/Expired	(279,104)
Number of Outstanding Options, Ending Balance	6,574,580	5,532,871
Number of Outstanding Options, Vested and expected to vest	6,574,580
Number of Outstanding Options, Exercisable	2,069,984
Weighted Average Exercise Price, Beginning Balance	$ 4.12
Weighted Average Exercise Price, Granted	32.17
Weighted Average Exercise Price, Exercised	2.16
Weighted Average Exercise Price, Forfeited/Expired	6.06
Weighted Average Exercise Price, Ending Balance	14.19	$ 4.12
Weighted Average Exercise Price, Vested and expected to vest	14.19
Weighted Average Exercise Price, Exercisable	$ 4.56
Weighted Average Remaining Contractual Term (Years)	8 years 2 months 12 days	8 years 6 months 18 days
Weighted Average Remaining Contractual Term (Years), Vested and expected to vest	8 years 2 months 12 days
Weighted Average Remaining Contractual Term (Years), Exercisable	6 years 7 months 9 days
Aggregate Intrinsic Value, Beginning Balance	$ 40,290
Aggregate Intrinsic Value, Ending Balance	108,155	$ 40,290
Aggregate Intrinsic Value, Vested and expected to vest	108,155
Aggregate Intrinsic Value, Exercisable	$ 50,494

Accrued Expenses and Other Current Liabilities (Tables)

12 Months Ended

Dec. 31, 2024

Accounts Payable and Accrued Liabilities, Current [Abstract]

Components of Accrued Expenses and Other Current Liabilities

The components of accrued expenses and other current liabilities for the years ended December 31, 2024 and 2023 were as follows (in thousands):


	December 31, 2024		December 31, 2023
External research and development expenses	$	7,181	$	6,164
Personnel-related expenses		5,793		2,822
Professional fees		1,255		341
Deferred offering costs		—		1,017
Other		436		99
Total accrued expenses and other current liabilities	$	14,665	$	10,443

Debt

12 Months Ended

Dec. 31, 2024

Debt Disclosure [Abstract]

Debt

13.

Debt

SVB Term Loan

In January 2021, the Company entered into the Loan Agreement with SVB for a term loan in three tranches. The Company drew down Tranche A funds in January 2021 for an original principal amount of $5.0 million, in increments of $2.5 million each. The Company drew down Tranche B funds in December 2021 for an original principal amount of $10.0 million, in increments of $5.0 million each, following the achievement of certain milestones. The Tranche C funds, for which the original principal amounts were not to exceed $5.0 million, in increments of $2.5 million each, were not drawn upon in 2021 or in 2022 and were only available on the achievement of certain milestones. In addition, at any time during the term of the Loan Agreement, the Company may request that SVB make one additional term loan available to the Company in an original principal amount equal to $10.0 million. SVB, in its sole and absolute discretion, may grant or deny any such request from the Company for this term loan.

In connection with the Loan Agreement, the Company entered into a Success Fee Agreement (the Success Fee Agreement) with SVB in January 2021. In accordance with the Success Fee Agreement, the Company agreed to pay to SVB an amount equal to (a) the quotient of (i) the aggregate original principal amount of all Term Loan Advances made by SVB to the Company divided by (ii) $5 million, multiplied by (b) $125,000 (the Success Fee), upon the closing of a success fee event (the Success Fee Event) and, in the event of an IPO, within five business days of closing such IPO. The Success Fee Event means the earliest to occur of any one of the following after January 8, 2021: (a) any sale, license, transfer or other disposition of all or substantially all of the assets of the Company or any of its subsidiaries; or (b) any reorganization, consolidation, or merger of the Company (or a subsidiary, but only if such subsidiary is a successor-in-interest to the Company’s business) where the holders of the Company’s securities (or such subsidiary’s securities) before the transaction beneficially own less than 50% of the outstanding voting securities of the surviving entity after the transaction, or (c) an IPO by the Company or such subsidiary of its capital stock. The Company’s obligation to pay SVB the Success Fee terminates on January 8, 2031.

The Company had the option to prepay all, but not less than all, of the Term Loan Advances advanced by SVB under the Loan Agreement, provided the Company delivers written notice to SVB of its election to prepay such Term Loan Advances at least thirty days prior to such prepayment and pays, on the date of such prepayment, all outstanding principal due in connection with the Term Loan Advances, plus accrued and unpaid interest thereon, a prepayment fee (the Prepayment Fee), the Final Payment, and all other sums, if any, that have become due and payable in connection with the Term Loan Advances.

On May 12, 2023, the Company repaid all outstanding principal and accrued and unpaid interest on the Term Loan Advances under the Loan Agreement and all other outstanding obligations with respect to the Term Loan Advances under the Loan Agreement and made the Final Payment. On March 5, 2024, the Company paid $0.4 million for the success fee under the Success Fee Agreement. As of December 31, 2024, the Company has no outstanding obligations in connection with the Loan Agreement with SVB.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1I

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1I

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1I

Related Parties - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Outside Consulting Firm \| Maximum
Related Party Transaction [Line Items]
Amount paid to consulting firm	$ 0.1	$ 0.4

Condensed Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	700,000,000	493,530,000
Common stock, shares issued	76,154,783	5,222,283
Common Stock, shares outstanding	76,154,783	5,222,283
Series A-1 Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock, par value	$ 0.0001	$ 0.0001
Redeemable convertible preferred stock, shares authorized	0	5,075,000
Redeemable convertible preferred stock, shares issued	0	5,075,000
Redeemable convertible preferred stock, shares outstanding	0	5,075,000
Redeemable convertible preferred stock, liquidation value	$ 0	$ 3,570
Series B Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock, par value	$ 0.0001	$ 0.0001
Redeemable convertible preferred stock, shares authorized	0	11,973,000
Redeemable convertible preferred stock, shares issued	0	11,973,000
Redeemable convertible preferred stock, shares outstanding	0	11,973,000
Redeemable convertible preferred stock, liquidation value	$ 0	$ 10,000
Series C Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock, par value	$ 0.0001	$ 0.0001
Redeemable convertible preferred stock, shares authorized	0	73,598,283
Redeemable convertible preferred stock, shares issued	0	73,598,283
Redeemable convertible preferred stock, shares outstanding	0	73,598,283
Redeemable convertible preferred stock, liquidation value	$ 0	$ 22,000
Series D Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock, par value	$ 0.0001	$ 0.0001
Redeemable convertible preferred stock, shares authorized	0	53,271,754
Redeemable convertible preferred stock, shares issued	0	53,271,754
Redeemable convertible preferred stock, shares outstanding	0	53,271,754
Redeemable convertible preferred stock, liquidation value	$ 0	$ 47,300
Series E Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock, par value	$ 0.0001	$ 0.0001
Redeemable convertible preferred stock, shares authorized	0	112,422,700
Redeemable convertible preferred stock, shares issued	0	112,422,700
Redeemable convertible preferred stock, shares outstanding	0	112,422,700
Redeemable convertible preferred stock, liquidation value	$ 0	$ 120,000
Series F Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock, par value	$ 0.0001	$ 0.0001
Redeemable convertible preferred stock, shares authorized	0	81,587,937
Redeemable convertible preferred stock, shares issued	0	81,587,937
Redeemable convertible preferred stock, shares outstanding	0	81,587,937
Redeemable convertible preferred stock, liquidation value	$ 0	$ 105,020

Fair Value Measurements

12 Months Ended

Dec. 31, 2024

Fair Value Disclosures [Abstract]

Fair Value Measurements

The following tables present the financial instruments carried at fair value on a recurring basis as of December 31, 2024 and 2023 in accordance with the ASC 820, Fair Value Measurement (ASC 820) hierarchy (in thousands):


	Fair Value Measurements at December 31, 2024
	Level 1		Level 2		Level 3		Total
Assets
Cash equivalents	$	256,204	$	—	$	—	$	256,204
Marketable securities	$	—	$	484,930	$	—	$	484,930

	Fair Value Measurements at December 31, 2023
	Level 1		Level 2		Level 3		Total
Assets
Cash equivalents	$	8,240	$	—	$	—	$	8,240
Marketable securities	$	—	$	179,408	$	—	$	179,408

Liabilities
Success fee liability	$	—	$	—	$	365	$	365

The Company’s cash equivalents represent deposits in a short-term U.S. Treasury money market fund quoted in an active market and were classified as a Level 1 fair value measurement. Marketable securities represent fixed income securities (U.S. treasury bills) with original maturities greater than 90 days and were classified as a level 2 fair value measurement.

The success fee liability associated with the Loan and Security Agreement (the Loan Agreement) the Company entered into in January 2021 was classified as a Level 3 fair value measurement, due to the use of unobservable inputs. See Note 13 for additional information on the Loan Agreement and success fee.

There were no transfers between Level 1 and Level 2 of the fair value hierarchy during the years ended December 31, 2024 and 2023, however, subsequent to December 31, 2024, the Company committed approximately $25 million of its cash equivalents to long-term use.

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 107
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-107

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 940
-SubTopic 820
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478119/940-820-50-1

Net Loss Per Share Attributable to Common Stockholders

Net Loss Per Share Attributable to Common Stockholders

12 Months Ended

Dec. 31, 2024

Earnings Per Share [Abstract]

14.

Net Loss Per Share Attributable to Common Stockholders

Basic and diluted net loss per share was calculated as follows (in thousands, except share and per share amounts):


	Year Ended December 31,
	2024			2023
Numerator:
Net loss and comprehensive loss	$	(88,039	)	$	(48,607	)
Deemed dividend on redeemable convertible preferred stock issuances		—			(410	)
Cumulative redeemable convertible preferred stock dividends		—			(18,781	)
Net loss attributable to common stockholders	$	(88,039	)	$	(67,798	)
Denominator:
Weighted-average common shares outstanding, basic and diluted		62,496,725			4,330,933
Net loss per share attributable to common stockholders, basic and diluted	$	(1.41	)	$	(15.65	)

The Company’s potentially dilutive securities, which include redeemable convertible preferred stock and stock options, have been excluded from the computation of diluted net loss per share as the effect would be to reduce the net loss per share. Basic and diluted net loss per share attributable to common stockholders is computed in conformity with the two-class method required for participating securities. The Company considers all series of its convertible preferred stock to be participating securities as the holders of such stock have the right to receive dividends on a pari passu basis in the event that a dividend is paid on common stock. Under the two-class method, the net loss attributable to common stockholders is not allocated to the convertible preferred stock as the preferred stockholders do not have a contractual obligation to share in the Company’s losses.


	December 31,
	2024		2023
Conversion of redeemable convertible preferred stock		-		38,413,913
Stock options outstanding		6,574,580		5,532,871
Total		6,574,580		43,946,784

Segment Disclosures - Additional Information (Details)	12 Months Ended
Segment Disclosures - Additional Information (Details)	Dec. 31, 2024 Segment
Segment Reporting [Abstract]
Number of operating segments	1
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]	srt:ChiefExecutiveOfficerMember
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description	The CODM uses consolidated net income (loss) to assess financial performance and allocate resources. The CODM does not review assets in evaluating the results of the single segment and therefore, such information is not presented.

Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Deficit (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Deemed dividend	$ 18,781
Series F Redeemable Convertible Preferred Stock
Deemed dividend	$ 410

Accrued Expenses and Other Current Liabilities

12 Months Ended

Dec. 31, 2024

Accounts Payable and Accrued Liabilities, Current [Abstract]

Accrued Expenses and Other Current Liabilities

The components of accrued expenses and other current liabilities for the years ended December 31, 2024 and 2023 were as follows (in thousands):


	December 31, 2024		December 31, 2023
External research and development expenses	$	7,181	$	6,164
Personnel-related expenses		5,793		2,822
Professional fees		1,255		341
Deferred offering costs		—		1,017
Other		436		99
Total accrued expenses and other current liabilities	$	14,665	$	10,443

Description of Business and Basis of Presentation - Additional Information (Details) $ / shares in Units, $ in Thousands		1 Months Ended	12 Months Ended
	Jan. 29, 2024 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) $ / shares	Dec. 31, 2023 USD ($)
Description of Business and Basis of Presentation [Line Items]
Reverse stock split description			On January 11, 2024, the Company’s board of directors approved a 1-for-9.535 reverse stock split of its issued and outstanding common stock and stock option awards which was effected on January 16, 2024.
Reverse stock split conversion ratio			0.105
Net proceeds			$ 223,059
Cash, cash equivalents and marketable securities		$ 742,000	742,000
Working capital		732,800	732,800
Accumulated deficit		$ (217,981)	(217,981)	$ (129,942)
Net loss			(88,039)	(48,607)
Cash flows from operations			$ (78,713)	$ (45,679)
IPO [Member]
Description of Business and Basis of Presentation [Line Items]
Common shares offering \| shares	20,000,000
Share price \| $ / shares	$ 19
Net proceeds	$ 399,600
Follow-on Offering [Member]
Description of Business and Basis of Presentation [Line Items]
Common shares offering \| shares		8,500,000
Share price \| $ / shares		$ 28	$ 28
Net proceeds		$ 223,100
Underwriters [Member]
Description of Business and Basis of Presentation [Line Items]
Share price \| $ / shares	$ 19
Stock issued shares under writers option exercised \| shares	3,000,000	1,200,000

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2024

Fair Value Disclosures [Abstract]

Summary of Financial Instruments Carried at Fair Value on Recurring Basis


	Fair Value Measurements at December 31, 2024
	Level 1		Level 2		Level 3		Total
Assets
Cash equivalents	$	256,204	$	—	$	—	$	256,204
Marketable securities	$	—	$	484,930	$	—	$	484,930

	Fair Value Measurements at December 31, 2023
	Level 1		Level 2		Level 3		Total
Assets
Cash equivalents	$	8,240	$	—	$	—	$	8,240
Marketable securities	$	—	$	179,408	$	—	$	179,408

Liabilities
Success fee liability	$	—	$	—	$	365	$	365

Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Income tax computed at federal statutory rate	21.00%	21.00%
State taxes, net of federal benefit	0.00%	0.00%
Permanent differences	(0.62%)	(0.64%)
Stock-based compensation	6.18%	(0.20%)
Research and development credit	2.64%	2.97%
Other	0.27%	0.59%
Valuation allowance	(29.47%)	(23.72%)
Effective income tax rate	0.00%	0.00%

Redeemable Convertible Preferred Stock - Summary of Redeemable Convertible Preferred Stock (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Series A-1 Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Authorized Shares	0	5,075,000
Shares Issued	0	5,075,000
Shares outstanding	0	5,075,000
Liquidation & Carrying Value	$ 0	$ 3,570
Common Stock Issuable Upon Conversion		1,252,438
Series B Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Authorized Shares	0	11,973,000
Shares Issued	0	11,973,000
Shares outstanding	0	11,973,000
Liquidation & Carrying Value	$ 0	$ 10,000
Common Stock Issuable Upon Conversion		3,508,584
Series C Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Authorized Shares	0	73,598,283
Shares Issued	0	73,598,283
Shares outstanding	0	73,598,283
Liquidation & Carrying Value	$ 0	$ 22,000
Common Stock Issuable Upon Conversion		7,718,740
Series D Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Authorized Shares	0	53,271,754
Shares Issued	0	53,271,754
Shares outstanding	0	53,271,754
Liquidation & Carrying Value	$ 0	$ 47,300
Common Stock Issuable Upon Conversion		5,586,959
Series E Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Authorized Shares	0	112,422,700
Shares Issued	0	112,422,700
Shares outstanding	0	112,422,700
Liquidation & Carrying Value	$ 0	$ 120,000
Common Stock Issuable Upon Conversion		11,790,523
Series F Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Authorized Shares	0	81,587,937
Shares Issued	0	81,587,937
Shares outstanding	0	81,587,937
Liquidation & Carrying Value	$ 0	$ 105,020
Common Stock Issuable Upon Conversion		8,556,669

Commitments and Contingencies - Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Leases [Abstract]
Operating lease cost	$ 228	$ 232
Total lease cost	228	232
Operating lease right-of-use asset obtained in exchange for new operating lease liabilities	0	221
Cash paid for amounts included in the measurement of lease liabilities, included in operating cash flows	$ 223	$ 219
Weighted-average remaining lease term	1 year 2 months 12 days	2 years 1 month 9 days
Weighted-average discount rate	1.63%	1.63%

License and Collaboration Agreements - Additional Information (Details) - USD ($)	1 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2021	Dec. 31, 2020
License and Collaboration Agreements [Line Items]
Collaboration and license fee revenue			$ 1,139,000	$ 204,000
Sale of redeemable convertible preferred stock				104,627,000
Lepu Biotech Co., Ltd.
License and Collaboration Agreements [Line Items]
One-time upfront payment		$ 4,500,000
Collaboration agreement transaction price		4,500,000
Collaboration and license fee revenue			1,000,000
Lepu Biotech Co., Ltd. \| Maximum
License and Collaboration Agreements [Line Items]
Regulatory milestone payments		2,500,000
Commercial milestone payments		$ 57,500,000
Collaboration and license fee revenue				100,000
Kissei Pharmaceutical Co., Ltd.
License and Collaboration Agreements [Line Items]
One-time upfront payment	$ 10,000,000
Development income			$ 200,000	$ 200,000	$ 400,000
Royalties	0
Total upfront payments to transaction price of exclusive license	10,000,000
Upfront payment recognized as revenue						$ 10,000,000
Milestone revenue recognized for cash consideration received					$ 10,000,000
Kissei Pharmaceutical Co., Ltd. \| Maximum
License and Collaboration Agreements [Line Items]
Commercial milestone payments	67,000,000
Development and regulatory milestone payments	33,000,000
Kissei Pharmaceutical Co., Ltd. \| Series D Redeemable Convertible Preferred Stock
License and Collaboration Agreements [Line Items]
Purchase of redeemable convertible preferred stock	30,000,000
Sale of redeemable convertible preferred stock	30,000,000
Total upfront payments	40,000,000
Upfront payments attributed to Series D redeemable convertible preferred stock sold	30,000,000
Upfront payments attributed to functional intellectual property license	10,000,000
Sale of redeemable convertible preferred stock at fair value	$ 30,000,000

Income Taxes

12 Months Ended

Dec. 31, 2024

Income Tax Disclosure [Abstract]

Income Taxes

12.

Income Taxes


	Year Ended December 31,
	2024			2023
Income tax computed at federal statutory rate		21.00	%		21.00	%
State taxes, net of federal benefit	(0.00)			(0.00)
Permanent differences		(0.62	)		(0.64	)
Stock-based compensation		6.18			(0.20	)
Research and development credit		2.64			2.97
Other		0.27			0.59
Valuation allowance		(29.47	)		(23.72	)
Effective income tax rate		0.00	%		(0.00	%)

The Company’s deferred tax assets as of December 31, 2024 and 2023, consisted of the following (in thousands):


	Year Ended December 31,
	2024			2023
Deferred tax assets:
Net operating losses	$	34,612		$	18,015
R&D credit		6,946			4,756
Foreign tax credit		425			424
Operating lease liabilities		50			97
Section 174		12,536			6,998
Other		1,884			266
Total gross deferred tax assets		56,453			30,556
Deferred tax liabilities:
Operating lease right-of-use assets		(46	)		(89	)
Other		(5	)		(10	)
Total gross deferred tax liabilities		(51	)		(99	)
Net deferred tax assets		56,402			30,457
Valuation allowance		(56,402	)		(30,457	)
Net deferred tax asset	$	—		$	—

Deferred tax assets are reduced by a valuation allowance if, based on the weight of available positive and negative evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. For the year ended December 31, 2024, the valuation allowance for deferred tax assets increased by $25.9 million. This increase was primarily related to the establishment of a valuation allowance against additional net operating loss (NOL), Section 174 capitalized research and experimental (R&E) costs and research credits generated in the current year.

As of December 31, 2024, the Company calculated $166.4 million and $0.2 million of federal and state NOL carryforwards, respectively. Of the $166.4 million in federal NOL carryforwards, $154.2 million is not subject to expiration and the other $12.3 million begin to expire in 2030. The state NOL carryforwards begin to expire in 2040. In addition, as of December 31, 2024, the Company had $7.7 million of federal research and development (R&D) credit carryovers which begin to expire in 2030 and $1.4 million of California credit carryovers, which can be carried forward indefinitely. There is also $0.1 million of Texas credit generated in 2024 that can be carried forward for twenty years. These loss and credit carryforwards are subject to review and possible adjustment by the appropriate taxing authorities.

Utilization of the Company’s NOL carryforwards and R&D credit carryforwards may be subject to a substantial annual limitation due to ownership change limitations that have occurred previously or that could occur in the future in accordance with Section 382 of the Internal Revenue Code of 1986 (Section 382) as well as similar state provisions. These ownership changes may limit the amount of NOL and R&D credit carryforwards that can be utilized annually to offset future taxable income and taxes, respectively. In general, an ownership change as defined by Section 382 results from transactions increasing the ownership of certain shareholders or public companies in the stock of a corporation by more than 50% over a three-year period. Since its formation, the Company has raised capital through the issuance of capital stock on several occasions. The Company believes one or more of these financings resulted in an ownership change as defined by Section 382, and consequently the Company’s utilization of the NOL carryforwards would be subject to an annual limitation under Section 382 of the Code. Any limitation may result in expiration of a portion of the NOL carryforwards before utilization.

As of December 31, 2024 and 2023, the Company recorded $1.4 million and $1.0 million unrecognized tax benefits, respectively. The Company’s policy is to recognize interest and penalties accrued on any uncertain tax positions as a component of income tax expense, if any, in its statements of income. For the years ended December 31, 2024 and 2023, no estimated interest or penalties were recognized on uncertain tax positions, and as of December 31, 2024 the Company has not incurred any material interest or penalties as of the current reporting date with respect to income tax matters.

The following reconciliation of the beginning and ending amount of gross unrecognized tax benefits, excluding interest and penalties, is as follows (in thousands):


	Year Ended December 31,
	2024			2023

Beginning balance of unrecognized tax benefits	$	1,000		$	691
Additions for prior year tax positions		(12	)		53
Additions for current year tax positions		409			256
Ending balance of unrecognized tax benefits	$	1,397		$	1,000

None of the unrecognized tax benefits, if recognized, would impact the annual effective tax rate, due to the valuation allowance. The Company’s unrecognized tax benefits are recorded as a reduction in deferred tax assets. The Company does not expect any significant increases or decreases to the Company’s unrecognized tax benefits within the next 12 months.

Tax Cuts and Jobs Act’s (TCJA) amendment to Section 174 required R&E expenditures to be capitalized in the year the amounts are incurred for amounts paid in tax years starting after December 31, 2021. The capitalized amounts are then amortized over a period of five years, if the research is performed within the U.S., or 15 years, with respect to non-U.S. based research. The amended statute specifies that amortization will begin with the midpoint of the taxable year in which expenses are paid or incurred, creating a significant first year impact.

The entire disclosure for income tax.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 231
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482663/740-10-55-231

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12C
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12C

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12B
-Publisher FASB
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-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477891/740-270-50-1

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-Paragraph 1
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Related Parties	12 Months Ended
Related Parties	Dec. 31, 2024
Related Party Transactions [Abstract]
Related Parties	15. Related Parties In 2023, the Company entered into an agreement with an outside consulting firm for the provision of interim Chief Financial Officer (CFO) services. The Company paid the consulting firm for the provision of the interim CFO services rendered less than $0.1 million and $0.4 million, respectively for services rendered for the years ended December 31, 2024 and 2023.

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

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Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Jan. 11, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock reserved for future issuance	13,580,666
Stock-based compensation expense	$ 11,402	$ 1,528
Gross unrecognized stock-based compensation expense	$ 55,400
Weighted average period of unrecognized compensation expense remained to be amortized	3 years 4 months 6 days
Stock Options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock reserved for future issuance	6,574,580
Common stock, shares outstanding	6,574,580	5,532,871
Shares of common stock issuable upon the exercise of stock options	989,445
Weighted average grant-date fair value of the options granted	$ 22.53	$ 4.27
Fair value of shares vested	5.9	$ 2.41
Fair value of shares exercised	$ 4.56
Stock-based compensation expense	$ 9,500	$ 1,500
2015 Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock, shares outstanding	921,231
2022 Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock, shares outstanding	3,356,572
2024 Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock, shares outstanding	2,296,777
Common stock available for future issuance	6,222,985		8,246,565
Fair Value \| Stock Options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Fair value of shares exercised	$ 2.16	$ 1.43

Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Income Taxes [Line Items]
Valuation allowance	$ 25,900,000
Federal NOL carryforwards	166,400,000
State NOL carryforwards	200,000
Net operating loss carryforward not subject to expiration	154,200,000
Net operating loss carryforward subject to expiration	12,300,000
Federal research and credit carryforward	7,700,000
Tax credit carryforward	1,400,000
Tax credit generated	$ 100,000
Tax credit carryforward period	20 years
Tax credit ownership percentage	50.00%
Tax credit ownership period	3 years
Unrecognized tax benefit	$ 1,400,000	$ 1,000,000
Interest	0	0
Penalty	$ 0	$ 0
Unrecognized tax benefit description	The Company does not expect any significant increases or decreases to the Company’s unrecognized tax benefits within the next 12 months.
U.S
Income Taxes [Line Items]
Amortization period	5 years
Non- U.S
Income Taxes [Line Items]
Amortization period	15 years

Commitments and Contingencies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2024 Claim Leases	Dec. 31, 2023 Claim Leases
Commitments and Contingencies Disclosure [Abstract]
Operating leases, description	As of December 31, 2024 and 2023, the Company had two operating leases, in which the Company is the lessee for office space. As of December 31, 2024, the lease terms were through 2025 and 2026.
Number of operating leases	2	2
Number of finance leases	0	0
Number of claims outstanding \| Claim	0	0

Common Stock - Schedule of Common Stock Reserved for Issuance Upon Conversion (Details)	Dec. 31, 2024 shares
Class of Stock [Line Items]
Common stock reserved for future issuance	13,580,666
Employee Stock Option
Class of Stock [Line Items]
Common stock reserved for future issuance	6,574,580
Reserved for Future Stock Option Issuances
Class of Stock [Line Items]
Common stock reserved for future issuance	6,222,990
Reserved for Future ESPP Issuances
Class of Stock [Line Items]
Common stock reserved for future issuance	783,096

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2024

Accounting Policies [Abstract]

Use of Estimates

The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates, assumptions, and judgments that affect the reported amounts of assets, liabilities, expenses, and related disclosures in the accompanying notes. The Company bases its estimates, assumptions and judgments on historical experience when available and on various factors that it believes to be reasonable under the circumstances as of the date of the accompanying consolidated financial statements including stock-based compensation expense, accrued research and development expenses, lease accounting, and the recoverability of the Company’s net deferred tax assets and related valuation allowance. In addition, other factors may affect estimates, including the expected business and operational changes, the sensitivity and volatility associated with the assumptions used in developing estimates, and whether historical trends are expected to be representative of future trends. Actual results could differ materially from the estimates and assumptions used in the preparation of the accompanying consolidated financial statements under different assumptions or conditions.

Cash, Cash Equivalents and Marketable Securities

The Company considers all highly liquid investments and instruments with original maturities of 90 days or less that can be liquidated without prior notice or penalty to be cash equivalents. Cash equivalents consisted primarily of demand deposit accounts, insurance deposits and short-term U.S. Treasury money market funds as of December 31, 2024 and 2023. Marketable securities represent fixed income securities which consists of U.S. Treasury bills with maturities greater than 90 days.

Concentration of Credit Risks

Financial instruments that subject the Company to significant concentrations of credit risk consist primarily of cash and cash equivalents. The Company deposits cash and cash equivalents with high credit quality financial institutions in the United States. These deposits are held in checking and money market accounts and may, from time to time, exceed the federally insured amounts. The Company has not experienced any losses in such accounts. The Company believes it is not exposed to any significant risk in its cash and cash equivalents. The primary objectives of the Company’s investment portfolio are the preservation of capital and maintenance of liquidity.

The Company is subject to risks common to companies in the biopharmaceutical industry, including, but not limited to, risks related to the successful development and commercialization of product candidates, fluctuations in operating results and financial risks, the ability to successfully raise additional funds when needed, protection of proprietary rights and patent risks, patent litigation, compliance with government regulations, dependence on key personnel and collaboration partners, and competition from competing products in the marketplace.

Fair Value of Financial Instruments

The Company applies fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. The Company’s financial instruments consist principally of cash, cash equivalents, marketable securities, accounts payable and operating lease liabilities. Fair value is measured as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. A fair value measurement assumes that the transaction to sell the asset or transfer the liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market. A framework is used for measuring fair value utilizing a three-tier hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3).

The three levels of the fair value hierarchy are as follows:

Level 1—Observable inputs such as unadjusted quoted prices in active markets that are accessible at the measurement date for identical unrestricted assets or liabilities the Company has the ability to access;

Level 2—Inputs (other than quoted prices included within Level 1) that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the asset or liability. These include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active; and

Level 3—Unobservable inputs that are significant to the fair value measurement and reflect the reporting entity’s use of significant management judgment and assumptions when there is little or no market data. Level 3 assets and liabilities include those whose fair value measurements are determined using pricing models, discounted cash flow methodologies or similar valuation techniques and significant management judgment or estimation.

Financial instruments are categorized in their entirety based on the lowest level of input that is significant to the fair value measurement. The assessment of the significance of a particular input to the fair value measurement requires judgment and considers factors specific to the investment. To the extent that the valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for instruments categorized in Level 3. The Company reviews the fair value hierarchy classification at each reporting date. Changes in the ability to observe valuation inputs may result in a reclassification of levels for certain assets or liabilities within the fair value hierarchy. The Company did not have any transfers of assets and liabilities between the levels of the fair value measurement hierarchy during the years presented.

Comprehensive Loss

There were no differences between net loss and comprehensive loss presented in the statements of operations for the years ended December 31, 2024 and 2023.

Property and Equipment, Net

Property and equipment are stated at cost, less accumulated depreciation. Depreciation is calculated over five years, which equals the estimated useful lives of the respective assets.

The initial cost of property and equipment consists of its purchase price and any directly attributable costs of bringing the asset to its working condition and location for its intended use. Expenditures incurred after the assets have been put into operation, such as repairs and maintenance, are charged to expense in the period in which the costs are incurred. Major replacements, improvements, and additions are capitalized in accordance with Company policy.

Impairment of Long-Lived Assets

The Company evaluates its long-lived assets, which consist of property and equipment and operating lease right-of-use assets, for impairment at least annually and whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable. Factors that the Company considers in deciding when to perform an impairment review include significant underperformance of the business in relation to expectations, significant negative industry or economic trends, and significant changes or planned changes in the use of the assets. If the asset is considered to be impaired, the amount of any impairment is measured as the difference between the carrying value and the fair value of the impaired asset. The Company recognized no impairment losses for the years ended December 31, 2024 and 2023.

Deferred Offering Costs

The Company capitalizes as deferred offering costs all direct and incremental legal, professional, accounting and other third-party fees incurred in connection with the Company’s IPO. The deferred offering costs was offset against the IPO proceeds upon the consummation of an offering. As of December 31, 2024 and 2023, respectively, the Company had zero and $4.7 million in deferred offering costs, of which $0.2 million were in accounts payable and $1.0 million were in accrued expenses.

Leases

Lease right-of-use assets represent the Company’s right to use an underlying asset for the lease term, and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. Operating lease right-of-use assets and liabilities are recognized when the Company takes possession of the leased property (the Commencement Date) based on the present value of lease payments over the lease term. At the inception of a contract, the Company determines whether the arrangement is or contains a lease based on the facts and circumstances present. The Company had no finance leases as of December 31, 2024 and 2023.

Operating lease right-of-use assets also include any lease payments made at or before lease commencement and exclude any lease incentives received. The lease terms used to calculate the right-of-use asset and related lease liability include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. The Company elects the practical expedient to exclude short-term agreements of less than 12 months from capitalization. The Company enters into various operating leases for office space. The leases expire at various dates, have various options to renew, and may contain escalation provisions.

Rent expense on cancelable leases containing known future scheduled rent increases is recorded on a straight-line basis over the term of the respective leases beginning on the Commencement Date. The difference between rent expense and rent paid is accounted for as a component of operating lease right-of-use assets on the accompanying balance sheets. Landlord improvement allowances and other such lease incentives are recorded as property and equipment and as a reduction of the right-of-use leased assets and are amortized on a straight-line basis as a reduction to operating lease costs. The key estimates for the Company’s leases include the incremental borrowing rate used to determine the present value of lease payments and the lease term. The Company’s leases generally do not include an implicit rate. Management determines the incremental borrowing rate based on the information available at lease commencement.

Operating lease right-of-use assets are initially measured at cost, which comprises the initial amount of the lease liability adjusted for lease payments made at or before the lease commencement date, plus any initial direct costs incurred less any lease incentives received. Operating lease right-of-use assets are subsequently measured throughout the lease term at the carrying amount of the lease liability, plus initial direct costs, plus (minus) any prepaid (accrued) lease payments, less the unamortized balance of lease incentives received. Lease expense for lease payments is recognized on a straight-line basis over the lease term. Operating lease liabilities are initially measured at the present value of the unpaid lease payments at the lease commencement date.

Revenue Recognition

The Company entered into development and license agreements with Lepu Biotech Co., Ltd. (Lepu) and Kissei Pharmaceutical Co., Ltd. (Kissei), collectively referred to as the License and Collaboration Agreements. See Note 6 for a description of the License and Collaboration Agreements.

At contract inception, the Company analyzes its collaboration arrangements to assess whether such arrangements involve joint operating activities performed by parties that are both active participants in the activities and exposed to significant risks and rewards dependent on the commercial success of such activities and therefore within the scope of ASC 808, Collaborative Arrangements (ASC 808). This assessment is performed throughout the life of the arrangement based on changes in the responsibilities of all parties in the arrangement. For collaboration arrangements within the scope of ASC 808 that contain multiple units of account, the Company first determines which components of the collaboration are deemed to be within the scope of ASC 808 and which components of the collaboration are more reflective of a vendor-customer relationship and therefore within the scope of ASC 606, Revenue Recognition (ASC 606).

For units of account of collaboration arrangements that are accounted for pursuant to ASC 808, an appropriate recognition method is determined and applied consistently, either by analogy to authoritative accounting literature or by applying a reasonable and rational policy election. The Company evaluates the income statement classification for presentation of amounts due from or owed to other participants associated with multiple activities in a collaboration arrangement based on the nature of each separate activity.

For units of account accounted within scope of ASC 606, to determine the appropriate amount of revenue to be recognized for the arrangements, the Company performs the following steps: (i) identification of the promised goods or services in the contract; (ii) determination of whether the promised goods or services are performance obligations including whether they are distinct in the context of the contract; (iii) measurement of the transaction price, including the constraint on variable consideration; (iv) allocation of the transaction price to the performance obligations; and (v) recognition of revenue when (or as) the Company satisfies each performance obligation.

The Company’s performance obligations under the terms of these agreements include a license grant, research and development services or customer options, depending on the terms of the License and Collaboration Agreement. Payments to the Company include a non-refundable upfront payment, payments based upon the achievement of development and commercial milestones, and royalties on product sales under the License and Collaboration agreements.

Development milestones

The License and Collaboration Agreements include milestone payments that are triggered by the achievement of development milestones. These milestone payments represent variable consideration that are not initially recognized within the transaction price. Revenue from milestones will be recognized at the time the specified milestone events have been achieved.

Sales milestones and royalty payments

The License and Collaboration Agreements also include certain sales-based milestone and royalty payments upon successful commercialization of a licensed product. In accordance with ASC 606, the Company recognizes revenue from sales-based milestone and royalty payments at the later of: (i) the occurrence of the subsequent sale; or (ii) the performance obligation to which some or all of the sales-based milestone or royalty payments has been allocated or has been satisfied. The Company anticipates recognizing these milestones and royalty payments if and when subsequent sales are generated.

Research and Development Expenses

Research and development (R&D) expenses consist of costs incurred for R&D of its product candidate and are recorded to operating expenses when incurred. The Company’s R&D expenses consist primarily of costs incurred in performing R&D activities, including personnel-related expenses such as salaries, stock-based compensation and benefits, as well as allocated facilities costs, dues and subscriptions and external costs of outside vendors engaged as contract research organization (CRO), contract manufacturers, consultants and other third parties to conduct and support our clinical trials and preclinical studies. The Company accrues expenses related to development activities performed by third parties based on an evaluation of services received and efforts expended pursuant to the terms of the contractual arrangements. Payments under some of these contracts depend on clinical trial milestones. There may be instances in which payments made to the Company’s vendors will exceed the level of services provided and result in a prepayment of expenses. In accruing service fees, the Company estimates the time period over which services will be performed and the level of effort to be expended in each period. If the actual timing of the performance of services or the level of effort varies from the estimate, the Company will adjust the accrual or prepaid expense accordingly. Costs to acquire technologies to be used in R&D that have not reached technological feasibility and have no alternative future use are also expensed as incurred.

Stock-Based Compensation

The Company periodically grants equity-based payment awards in the form of stock options to employees, directors and non-employees and records stock-based compensation expenses for awards of stock-based payments based on their estimated fair value at the grant date. The Company recognizes stock-based compensation expense for all equity-based payments, including stock options. Stock-based compensation costs are calculated based on the estimated fair value of the underlying option using the Black-Scholes option pricing model on the date of grant for stock options and are recognized as expense in the accompanying statement of operations and comprehensive loss on a straight-line basis over the requisite service period, which is the vesting period. Determining the appropriate fair value model and related input assumptions requires judgment, including estimating the fair value of the Company’s common stock, stock price volatility, and expected term. For any performance-based awards, the Company assesses the probability of the likelihood of achievement and recognizes the related expense accordingly.

The Company recognizes forfeitures related to stock-based compensation awards as they occur.

The Company classifies stock-based compensation expense in the statement of operations in the same manner in which the award recipients’ payroll costs are classified or in which the award recipients’ service payments are classified.

Income Taxes

The Company accounts for income taxes in accordance with ASC 740, Income Taxes (ASC 740). ASC 740 requires the use of the asset and liability method of accounting for income taxes. The current or deferred tax consequences of a transaction are measured by applying the provisions of enacted tax laws to determine the amount of taxes payable currently or in future years. Deferred tax assets and liabilities are determined based on the difference between the financial statements and tax basis of assets and liabilities and expected future tax consequences of events that have been included in the consolidated financial statements or tax returns using enacted tax rates in effect for the year in which the differences are expected to reverse. Under this method, a valuation allowance is used to offset deferred tax assets if, based upon the available evidence, it is more likely than not that some or all of the deferred tax assets may not be realized. Management annually evaluates the recoverability of deferred taxes and the adequacy of the valuation allowance. See Note 12 for additional information.

The Company follows the provisions of ASC 740 relative to accounting for uncertain tax positions. These provisions provide guidance on the recognition, de-recognition and measurement of potential tax benefits associated with tax positions. For those benefits to be recognized, a tax position must be more likely than not to be sustained upon examination by taxing authorities. As applicable, the Company recognizes accrued penalties and interest related to unrecognized tax benefits in the provision for income taxes.

Significant judgment is required in determining the Company’s provision for income taxes, deferred tax assets and liabilities and the valuation allowance recorded against net deferred tax assets. The Company assesses the likelihood that deferred tax assets will be recovered as deductions from future taxable income. The evaluation of the need for a valuation allowance is performed on a jurisdiction-by-jurisdiction basis and includes a review of all available positive and negative evidence. Factors reviewed include projections of pre-tax book income for the foreseeable future, determination of cumulative pre-tax book income after permanent differences, earnings history and reliability of forecasting.

The Company is required to file federal and state income tax returns in the U.S. The preparation of state tax returns requires the Company to interpret the applicable tax laws and regulations in effect in such jurisdictions, which could affect the amount of tax paid by the Company.

The Company’s income tax returns are based on calculations and assumptions that are subject to examination by the IRS and other tax authorities. In addition, the calculation of the Company’s tax liabilities involves dealing with uncertainties in the application of complex tax regulations. The Company recognizes liabilities for uncertain tax positions based on a two-step process. The first step is to evaluate the tax position for recognition by determining if the weight of available evidence indicates that it is more likely than not that the position will be sustained on audit, including resolution of related appeals or litigation processes, if any. The second step is to measure the tax benefit as the largest amount that is more than 50% likely of being realized upon settlement. While the Company believes it has appropriate support for the positions taken on its tax returns, the Company regularly assesses the potential outcomes of examinations by tax authorities in determining the adequacy of its provision for income taxes. The Company continually assesses the likelihood and amount of potential revisions and adjusts the income tax provision, income taxes payable and deferred taxes in the period in which the facts that give rise to a revision become known.

The Company follows the accounting guidance on accounting for uncertainty in income taxes. The guidance prescribes a recognition threshold and measurement attribute criteria for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return.

Classification of Redeemable Convertible Preferred Stock

Classification of the Company’s Series A-1, B, C, D, E and F redeemable convertible preferred stock is being treated as mezzanine equity and not as part of stockholders’ deficit because the holders of such shares have liquidation rights in the event of a deemed liquidation that, in certain situations, are not solely within the control of the Company and would require the redemption of the then-outstanding redeemable convertible preferred stock. In addition, all of the Company’s redeemable convertible preferred stock are redeemable with the passage of time on or after July 28, 2028, by class and if requested by a requisite majority of each class. See Note 7 for additional information, including the conversion of all redeemable convertible preferred stock as of December 31, 2024.

The carrying values of the Series A-1, B, C, D, E and F redeemable convertible preferred stock are reported at their respective redemption values.

Net Loss Per Share Attributable to Common Stockholders

The Company determined all of its redeemable convertible preferred stock qualifies as participating securities, as defined in ASC 260, Earnings per Share (ASC 260) earnings with common stock. In accordance with ASC 260, a company is required to use the two-class method when computing net income (loss) per share when a company has securities that qualify as participating securities. The two-class method is an earnings allocation formula that determines net income (loss) per share for each class of common stock and participating security according to dividends declared (or accumulated) and participation rights in undistributed earnings. Under the two-class method, the net loss attributable to common stockholders is not allocated to the convertible preferred stock as the preferred stockholders do not have a contractual obligation to share in the Company’s losses.

Segment and Geographic Information

Operating segments are defined as components of an enterprise (business activity from which it earns revenue and incurs expenses) about which discrete financial information is available and regularly reviewed by the chief operating decision maker in deciding how to allocate resources and in assessing performance. The Company’s chief operating decision maker is its Chief Executive Officer. The chief operating decision maker reviews consolidated operating results to make decisions about allocating resources and assessing performance for the entire company. The Company views its operations and manages its business as one operating segment. All of the Company’s assets are located in the United States. See Note 7 for additional information.

Recently Issued Accounting Standards

Accounting standards not listed below were assessed and determined not to be applicable or are expected to have minimal impact on the Company’s consolidated financial statements.

In November 2023, the FASB issued Accounting Standards Update 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures (ASU 2023-07). The guidance includes the requirements that a public entity disclose, on an annual and interim basis, significant segment expenses that are regularly provided to the chief operating decision maker and included within each reported measure of segment profit or loss, the title and position of the chief operating decision maker, and an explanation of how the chief operating decision maker uses the reported measure(s) of segment profit or loss in assessing segment performance and deciding how to allocate resources. The guidance also requires that a public entity that has a single reportable segment provide all the disclosures required by the guidance and all existing segment disclosures in ASC 280, Segment Reporting. The guidance is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The Company adopted this standard for the year ended December 31, 2024 and applied the amendments retrospectively to all periods presented in the consolidated financial statements. See our segments disclosure in Note 7 for further detail.

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. The guidance includes the requirement that public business entities, on an annual basis, disclose specific categories in the rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold (if the effect of those reconciling items is equal to or greater than 5% of the amount computed by multiplying pretax income (or loss) by the applicable statutory income tax rate). It also requires that all entities disclose, on an annual basis, the amount of income taxes paid (net of refunds received) disaggregated by federal (national), state, and foreign taxes and the amount of income taxes paid (net of refunds received) disaggregated by individual jurisdictions in which income taxes paid (net of refunds received) is equal to or greater than 5% of total income taxes paid (net of refunds received) and requires that all entities disclose income (or loss) from continuing operations before income tax expense (or benefit) disaggregated between domestic and foreign and income tax expense (or benefit) from continuing operations disaggregated by federal (national), state, and foreign. Lastly, the guidance eliminates the requirement for all entities to disclose the nature and estimate of the range of the reasonably possible change in the unrecognized tax benefits balance in the next 12 months or make a statement that an estimate of the range cannot be made. For public business entities, the guidance is effective for annual periods beginning after December 15, 2024. Early adoption is permitted for annual financial statements that have not yet been issued or made available for issuance. The guidance should be applied on a prospective basis. Retrospective application is permitted. The Company is currently evaluating the impact that this guidance may have on its consolidated financial statements.

In November 2024, the FASB issued ASU No. 2024-03, Comprehensive Income - Expense Disaggregation Disclosures , which will improve the disclosures about a public business entity's expenses and address requests from investors for more detailed information about the types of expenses in commonly presented expense captions such as cost of sales, selling, general and administrative, and research and development. The amendments are effective for fiscal years beginning after December 15, 2026. Early adoption is permitted for annual financial statements that have not yet been issued or made available. The amendments should be applied on either (1) prospectively to financial statements issued for reporting periods after the effective date or (2) retrospectively to any or all prior periods presented in the financial statements. The Company is currently evaluating the provisions of the amendments and the effect on its future consolidated financial statements.

Stock-Based Compensation - Summary of Stock-based Compensation Expense Related to Stock Options (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	$ 11,402	$ 1,528
Research and Development
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	3,736	795
General and Administrative
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	$ 7,666	$ 733

Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Deficit - USD ($) $ in Thousands	Total	Initial Public Offering	Public Offering	Common Stock	Common Stock Initial Public Offering	Common Stock Public Offering	Additional Paid-in Capital	Additional Paid-in Capital Initial Public Offering	Additional Paid-in Capital Public Offering	Accumulated Deficit	Series A-1 Redeemable Convertible Preferred Stock	Series A-1 Redeemable Convertible Preferred Stock Preferred Stock	Series B Redeemable Convertible Preferred Stock	Series B Redeemable Convertible Preferred Stock Preferred Stock	Series C Redeemable Convertible Preferred Stock	Series C Redeemable Convertible Preferred Stock Preferred Stock	Series D Redeemable Convertible Preferred Stock	Series D Redeemable Convertible Preferred Stock Preferred Stock	Series E Redeemable Convertible Preferred Stock	Series E Redeemable Convertible Preferred Stock Preferred Stock	Series F Redeemable Convertible Preferred Stock	Series F Redeemable Convertible Preferred Stock Preferred Stock
Beginning balance, shares at Dec. 31, 2022												5,075,000		11,973,000		73,598,283		53,271,754		112,422,700
Beginning balance at Dec. 31, 2022												$ 3,570		$ 10,000		$ 22,000		$ 47,300		$ 120,000
Beginning balance, shares at Dec. 31, 2022				3,842,694
Beginning balance at Dec. 31, 2022	$ (77,693)						$ 3,642			$ (81,335)
Issuance of Series F redeemable convertible preferred stock (inclusive of deemed dividend of $410 to accrete to redemption value), shares																						81,587,937
Issuance of Series F redeemable convertible preferred stock (inclusive of deemed dividend of $410 to accrete to redemption value), value																						$ 105,020
Issuance of Series F redeemable convertible preferred stock (inclusive of deemed dividend of $410 to accrete to redemption value)	(410)						(410)
Issuance of common stock, net of issuance costs, shares				1,379,589
Issuance of common stock, net of issuance costs	2,082						2,082
Stock-based compensation expense	1,528						1,528
Net loss	(48,607)									(48,607)
Ending balance, shares at Dec. 31, 2023											5,075,000	5,075,000	11,973,000	11,973,000	73,598,283	73,598,283	53,271,754	53,271,754	112,422,700	112,422,700	81,587,937	81,587,937
Ending balance at Dec. 31, 2023											$ 3,570	$ 3,570	$ 10,000	$ 10,000	$ 22,000	$ 22,000	$ 47,300	$ 47,300	$ 120,000	$ 120,000	$ 105,020	$ 105,020
Ending balance, shares at Dec. 31, 2023				5,222,283
Ending balance at Dec. 31, 2023	$ (123,100)						6,842			(129,942)
Conversion of redeemable convertible preferred stock, shares	38,413,909											(5,075,000)		(11,973,000)		(73,598,283)		(53,271,754)		(112,422,700)		(81,587,937)
Conversion of redeemable convertible preferred stock, value												$ (3,570)		$ (10,000)		$ (22,000)		$ (47,300)		$ (120,000)		$ (105,020)
Conversion of redeemable convertible preferred stock, shares	38,413,909			38,413,909
Conversion of redeemable convertible preferred stock, value	$ 307,890			$ 4			307,886
Issuance of common stock, net of issuance costs, shares				1,018,591	23,000,000	8,500,000
Issuance of common stock, net of issuance costs	2,599	$ 399,565	$ 223,060		$ 3	$ 1	2,599	$ 399,562	$ 223,059
Stock-based compensation expense	11,402						11,402
Net loss	(88,039)									(88,039)
Ending balance, shares at Dec. 31, 2024											0		0		0		0		0		0
Ending balance at Dec. 31, 2024											$ 0		$ 0		$ 0		$ 0		$ 0		$ 0
Ending balance, shares at Dec. 31, 2024				76,154,783
Ending balance at Dec. 31, 2024	$ 733,377			$ 8			$ 951,350			$ (217,981)

Common Stock - Additional Information (Details) - shares	Dec. 31, 2024	Dec. 31, 2023
Equity [Abstract]
Common stock, shares authorized	700,000,000	493,530,000
Common stock, shares issued	76,154,783	5,222,283
Common Stock, shares outstanding	76,154,783	5,222,283

Fair Value Measurements - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Jan. 01, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities representing fixed income securities (U.S. treasury bills) maturity description	original maturities greater than 90 days
Transfers between Level 1 and Level 2 of fair value hierarchy	$ 0	$ 0
Subsequent Event [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents			$ 25,000,000

Stock-Based Compensation - Summary of Assumptions Used in Determining Fair Value of Option Awards (Details) - Stock Options	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Expected volatility, Minimum	77.34%
Expected volatility, Maximum	84.50%
Expected volatility		81.60%
Risk-free interest rate, Minimum	3.46%	3.58%
Risk-free interest rate, Maximum	4.62%	4.77%
Expected dividend yield	0.00%	0.00%
Expected term (in years)		6 years
Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Expected term (in years)	6 years 1 month 6 days
Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Expected term (in years)	6 years

Debt - Additional Information (Details)	12 Months Ended
Debt - Additional Information (Details)	Dec. 31, 2024 USD ($)	Mar. 05, 2024 USD ($)	Dec. 31, 2021 USD ($)	Jan. 31, 2021 USD ($) Tranche
Debt Instrument [Line Items]
Debt description	In January 2021, the Company entered into the Loan Agreement with SVB for a term loan in three tranches. The Company drew down Tranche A funds in January 2021 for an original principal amount of $5.0 million, in increments of $2.5 million each. The Company drew down Tranche B funds in December 2021 for an original principal amount of $10.0 million, in increments of $5.0 million each, following the achievement of certain milestones. The Tranche C funds, for which the original principal amounts were not to exceed $5.0 million, in increments of $2.5 million each, were not drawn upon in 2021 or in 2022 and were only available on the achievement of certain milestones. In addition, at any time during the term of the Loan Agreement, the Company may request that SVB make one additional term loan available to the Company in an original principal amount equal to $10.0 million. SVB, in its sole and absolute discretion, may grant or deny any such request from the Company for this term loan.
Loan Agreement with SAB
Debt Instrument [Line Items]
Number of tranches \| Tranche				3
Success fee				$ 5,000,000
Debt outstanding obligations	$ 0
Loan Agreement with SAB \| Tranche A Funds
Debt Instrument [Line Items]
Original principal amount				5,000,000
Original principal amount in increments				2,500,000
Loan Agreement with SAB \| Tranche B Funds
Debt Instrument [Line Items]
Original principal amount			$ 10,000,000
Original principal amount in increments			$ 5,000,000
Loan Agreement with SAB \| Tranche C Funds \| Maximum
Debt Instrument [Line Items]
Original principal amount				5,000,000
Original principal amount in increments				2,500,000
Additional term loan with SVB
Debt Instrument [Line Items]
Original principal amount				10,000,000
Success Fee Agreement with SVB
Debt Instrument [Line Items]
Success fee		$ 400,000		$ 125,000,000
Percentage of outstanding voting securities owned	50.00%
Success fee agreement description	In connection with the Loan Agreement, the Company entered into a Success Fee Agreement (the Success Fee Agreement) with SVB in January 2021. In accordance with the Success Fee Agreement, the Company agreed to pay to SVB an amount equal to (a) the quotient of (i) the aggregate original principal amount of all Term Loan Advances made by SVB to the Company divided by (ii) $5 million, multiplied by (b) $125,000 (the Success Fee), upon the closing of a success fee event (the Success Fee Event) and, in the event of an IPO, within five business days of closing such IPO. The Success Fee Event means the earliest to occur of any one of the following after January 8, 2021: (a) any sale, license, transfer or other disposition of all or substantially all of the assets of the Company or any of its subsidiaries; or (b) any reorganization, consolidation, or merger of the Company (or a subsidiary, but only if such subsidiary is a successor-in-interest to the Company’s business) where the holders of the Company’s securities (or such subsidiary’s securities) before the transaction beneficially own less than 50% of the outstanding voting securities of the surviving entity after the transaction, or (c) an IPO by the Company or such subsidiary of its capital stock. The Company’s obligation to pay SVB the Success Fee terminates on January 8, 2031.

Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Significant Accounting Policy [Line Items]
Investment instruments maturity description	highly liquid investments and instruments with original maturities of 90 days or less that can be liquidated without prior notice or penalty to be cash equivalents. Cash equivalents consisted primarily of demand deposit accounts, insurance deposits and short-term U.S. Treasury money market funds as of December 31, 2024 and 2023. Marketable securities represent fixed income securities which consists of U.S. Treasury bills with maturities greater than 90 days.
Transfer in to level 3	$ 0
Transfer out of level 3	0
Net loss and comprehensive loss	$ 0	$ 0
Depreciation calculated period	5 years
Impairment losses	$ 0	0
Deferred offering costs	0	4,700,000
Deferred offering costs accounts payable		200,000
Deferred offering costs accrued expenses		1,000,000
Finance leases	$ 0	$ 0
Short term agreement period	12 years
Tax benefit percentage	50.00%
Minimum
Significant Accounting Policy [Line Items]
Reconciliation percentage	5.00%
Percentage of income tax paid	5.00%

Condensed Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 257,068	$ 8,266
Marketable securities	484,930	179,408
Prepaid expenses and other current assets	11,431	6,358
Accounts receivable - other	781	92
Total current assets	754,210	194,124
Property and equipment, net	272	69
Operating lease right-of-use assets	221	422
Other assets	94	19
Deferred offering costs	0	4,667
Total assets	754,797	199,301
Current liabilities:
Accounts payable	6,517	3,242
Success fee liability, current portion	0	352
Operating lease liabilities, current portion	186	217
Accrued expenses and other current liabilities	14,665	10,443
Total current liabilities	21,368	14,254
Success fee liability, non-current	0	13
Operating lease liabilities, net of current portion	52	244
Total liabilities	21,420	14,511
Commitments and contingencies
Stockholders' equity (deficit):
Common stock, $0.0001 par value per share; 700,000,000 and 493,530,000 shares authorized as of December 31, 2024 and December 31, 2023, respectively; 76,154,783 and 5,222,283 shares issued and outstanding as of December 31, 2024 and December 31, 2023, respectively	8
Additional paid-in capital	951,350	6,842
Accumulated deficit	(217,981)	(129,942)
Total stockholders' equity (deficit)	733,377	(123,100)
Total liabilities, redeemable convertible preferred stock and stockholders' equity (deficit)	754,797	199,301
Series A-1 Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock:
Redeemable convertible preferred stock	0	3,570
Series B Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock:
Redeemable convertible preferred stock	0	10,000
Series C Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock:
Redeemable convertible preferred stock	0	22,000
Series D Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock:
Redeemable convertible preferred stock	0	47,300
Series E Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock:
Redeemable convertible preferred stock	0	120,000
Series F Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock:
Redeemable convertible preferred stock	$ 0	$ 105,020

Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Revenues
License and collaboration revenue	$ 1,139	$ 204
Operating expenses
Research and development	82,102	45,752
General and administrative	33,703	9,901
Total operating expenses	115,805	55,653
Loss from operations	(114,666)	(55,449)
Other income (expense), net:
Interest income, net	26,624	6,904
Other income (expense), net	3	(62)
Total other income, net	26,627	6,842
Net loss and comprehensive loss	(88,039)	(48,607)
Deemed dividend on redeemable convertible preferred stock issuances	0	(410)
Cumulative redeemable convertible preferred stock dividends	0	(18,781)
Net loss attributable to common stockholders	$ (88,039)	$ (67,798)
Net loss per share , basic	$ (1.41)	$ (15.65)
Net loss per share , diluted	$ (1.41)	$ (15.65)
Weighted average shares of common stock outstanding, basic	62,496,725	4,330,933
Weighted average shares of common stock outstanding, diluted	62,496,725	4,330,933

Commitments and Contingencies - Schedule of Maturities of Lease Liabilities (Details) $ in Thousands	Dec. 31, 2024 USD ($)
Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract]
2025	$ 187
2026	52
Total lease payment	239
Less: amount representing imputed interest	(1)
Total future minimum lease obligations	$ 238

Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2024

Share-Based Payment Arrangement [Abstract]

Summary of Assumptions Used in Determining Fair Value of Option Awards

The following table provides the assumptions used in determining the fair value of option awards for the years ended December 31, 2024 and 2023:


	Year Ended December 31,
	2024	2023
Expected volatility	77.34% - 84.50%	81.6%
Risk-free interest rate	3.46% - 4.62%	3.58% - 4.77%
Expected dividend yield	0%	0%
Expected term (in years)	6.0 - 6.1	6.0

Summary of Stock Option Activity

The following table summarizes stock option activity for the year ended December 31, 2024 (in thousands, except share and per share amounts):


	Number of Outstanding Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term		Aggregate Intrinsic Value
						(Years)
Balance at December 31, 2023		5,532,871		$	4.12		8.55	$	40,290
Granted		2,310,258		$	32.17
Exercised		(989,445	)	$	2.16
Forfeited/Expired		(279,104	)	$	6.06
Balance at December 31, 2024		6,574,580		$	14.19		8.20	$	108,155
Vested and expected to vest at December 31, 2024		6,574,580		$	14.19		8.20	$	108,155
Exercisable at December 31, 2024		2,069,984		$	4.56		6.61	$	50,494

Summary of Stock-based Compensation Expense Related to Stock Options

Stock-based compensation expense related to stock options recorded in the accompanying statements of operations for the years ended December 31, 2024 and 2023 was as follows (in thousands):


	For the Year Ended December 31,
	2024		2023
Research and development	$	3,736	$	795
General and administrative		7,666		733
Total stock-based compensation expense	$	11,402	$	1,528

Insider Trading Policies and Procedures	12 Months Ended
Insider Trading Policies and Procedures	Dec. 31, 2024
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

Insider Trading Arrangements

3 Months Ended

Dec. 31, 2024

Trading Arrangements, by Individual

Material Terms of Trading Arrangement

Trading Arrangements

During the quarter ended December 31, 2024, an entity affiliated with one of our directors terminated a trading plan for the orderly disposition of the Company’s securities as set forth in the table below.


			Type of Trading Arrangement
Name and Position	Action	Adoption/Termination Date	Rule 10b5-1(1)	Non-Rule 10b5-1(2)	Total Shares of Common Stock to be Sold	Expiration Date
Charming Jade Limited*	Termination(3)	December 13, 2024	X		1,266,814	The earlier to occur of (i) June 11, 2025, and (ii) the execution of all instructions provided in the plan

(1) Contract, instruction or written plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act.

(2) “Non-Rule 10b5-1 trading arrangement” as defined in Item 408(c) of Regulation S-K under the Exchange Act.

(3) Represents the termination of a trading plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) adopted on September 13, 2024.

* Charming Jade Limited is a wholly owned subsidiary of ORI Healthcare Fund II, L.P. ORI Capital II Inc. is the general partner of ORI Healthcare Fund II, L.P. and a wholly owned subsidiary of ORI Holding II Inc. Each of ORI Capital Holding Inc. and ORI Holding II Inc. is a wholly owned subsidiary of Healthcare Seed Limited. Ms. Hong Fang Song, who serves on our Board of Directors, is the sole owner of Healthcare Seed Limited.

Charming Jade Limited

Trading Arrangements, by Individual

Name

Charming Jade Limited

Rule 10b5-1 Arrangement Adopted

true

Adoption Date

September 13, 2024

Rule 10b5-1 Arrangement Terminated

true

Non-Rule 10b5-1 Arrangement Terminated

false

December 13, 2024

June 11, 2025

272 days

1,266,814

Net Loss Per Share Attributable to Common Stockholders - Schedule of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Earnings Per Share [Abstract]
Net Income (Loss)	$ (88,039)	$ (48,607)
Deemed dividend on redeemable convertible preferred stock issuances	0	(410)
Cumulative redeemable convertible preferred stock dividends	0	(18,781)
Net loss attributable to common stockholders	$ (88,039)	$ (67,798)
Weighted-average common shares outstanding, basic	62,496,725	4,330,933
Weighted-average common shares outstanding, diluted	62,496,725	4,330,933
Net loss per share attributable to common stockholders, basic	$ (1.41)	$ (15.65)
Net loss per share attributable to common stockholders, diluted	$ (1.41)	$ (15.65)

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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Segment Disclosures

12 Months Ended

Dec. 31, 2024

Segment Reporting [Abstract]

Segment Disclosures

The Company operates as a single operating segment. The Company's chief operating decision maker (CODM) is its chief executive officer, who reviews financial information presented on a consolidated basis. The CODM uses consolidated net income (loss) to assess financial performance and allocate resources. The CODM does not review assets in evaluating the results of the single segment and therefore, such information is not presented.

The following table presents selected financial information with respect to the Company's single operating segment for the years ended December 31, 2024 and 2023:


	Year Ended December 31,
	2024			2023
Revenue	$	1,139		$	204
Less:
Research and development
Clinical and manufacturing		66,462			35,966
Other research and development(1)		15,640			9,786
Total research and development		82,102			45,752
General and administrative		33,703			9,901
Total operating expenses		115,805			55,653
Loss from operations		(114,666	)		(55,449	)
Other income, net		26,627			6,842
Net loss	$	(88,039	)	$	(48,607	)
(1) Other research and development consists of indirect costs incurred for the benefit of the research and development efforts, including certain personnel, supply chain, and quality assurance.

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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Common Stock

12 Months Ended

Dec. 31, 2024

Common Stock

The Company is authorized to issue up to 700,000,000 and 493,530,000 shares of common stock as of December 31, 2024 and 2023, respectively, of which 76,154,783 and 5,222,283 shares were issued and outstanding as of December 31, 2024 and 2023, respectively.

Voting, dividend and liquidation rights of the holders of the common stock as of December 31, 2023 are subject to and qualified by the rights, preferences and privileges of the holders of the redeemable convertible preferred stock.

Voting

Each holder of outstanding shares of common stock shall be entitled to one vote in respect of each share. The holders of outstanding shares of common stock, voting together as a single class, shall be entitled to elect one director. The number of authorized shares of common stock may be increased or decreased by the affirmative vote of a majority of the outstanding shares of common stock and preferred stock voting together as a single class.

Dividends

Subject to the payment in full of all preferential dividends to which the holders of the preferred stock are entitled, the holders of common stock shall be entitled to receive dividends out of funds legally available therefor at such times and in such amounts as the Board may determine in its sole discretion, with holders of preferred stock and common stock sharing pari passu in such dividends.

Liquidation Rights

After payment in full of all preferential amounts to which the holders of preferred stock are entitled upon any voluntary or involuntary liquidation, dissolution or winding-up of the Company or deemed liquidation event of the Company, all of the remaining assets of the Company available for distribution to the stockholders shall be distributed among the holders of the preferred stock and common stock, pro rata based on the number of shares held by each such holder on an as converted to common stock basis.

Reserved Shares


	December 31,
	2024
Stock options outstanding		6,574,580
Reserved for future stock option issuances		6,222,990
Reserved for future ESPP issuances		783,096
Total		13,580,666

The entire disclosure for equity.

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Condensed Statements of Cash Flows (Parenthetical)	12 Months Ended
Condensed Statements of Cash Flows (Parenthetical)	Dec. 31, 2024 shares
Statement of Cash Flows [Abstract]
Reclassification of redeemable convertible preferred stock	38,413,909
Reclassification of common stock	38,413,909

Income Taxes - Schedule of Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Unrecognized Tax Benefits [Roll Forward]
Beginning balance of unrecognized tax benefits	$ 1,000	$ 691
Additions for prior year tax positions	(12)	53
Additions for current year tax positions	409	256
Ending balance of unrecognized tax benefits	$ 1,397	$ 1,000

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Operating Activities
Net loss	$ (88,039)	$ (48,607)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	32	17
Amortization of loan fees		3
Final payment amortization and loss on debt extinguishment		767
Success fee amortization		37
Stock-based compensation expense	11,402	1,528
Accretion of discount on short-term investments	(4,992)	(2,875)
Non-cash lease expense	(22)	12
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(5,073)	(2,723)
Accounts receivable - other	(689)
Other assets	(75)	13
Accounts payable	3,275	2,012
Accrued expenses and other current liabilities	5,468	4,137
Net cash used in operating activities	(78,713)	(45,679)
Investing Activities
Proceeds from sales and maturities of short-term investments	745,412	396,416
Purchases of short-term investments	(1,045,942)	(517,611)
Purchases of property and equipment	(234)
Net cash used in investing activities	(300,764)	(121,195)
Financing Activities
Proceeds from initial public offering, net of issuance costs	406,410
Proceeds from Issuance of Common Stock	223,059
Proceeds from issuance of Series F redeemable convertible preferred stock, net of issuance costs		104,627
Payments of success fee or long-term debt	(365)	(16,291)
Proceeds from exercise of common stock options and issuance of common stock under the employee stock purchase plan	2,599	2,082
Deferred offering costs	(3,424)	(3,421)
Net cash provided by financing activities	628,279	86,997
Net increase (decrease) in cash and cash equivalents	248,802	(79,877)
Cash and cash equivalents at beginning of period	8,266	88,143
Cash and cash equivalents at end of period	257,068	8,266
Supplemental Disclosure of Cash Flow Information
Cash paid for interest		376
Supplemental Schedule of Non-cash Investing and Financing Activities:
Reclassification of 38,413,909 redeemable convertible preferred stock to 38,413,909 shares of common stock	307,890
Conversion of deferred offering costs	6,845
Deferred offering costs, unpaid and accrued		1,246
Operating lease right-of-use asset obtained in exchange for lease liabilities	$ 0	$ 221

Redeemable Convertible Preferred Stock (Tables)

12 Months Ended

Dec. 31, 2024

Summary of Redeemable Convertible Preferred Stock

Redeemable convertible preferred stock consisted of the following as of December 31, 2023 (in thousands, except share amounts):


December 31, 2023	Authorized Shares		Shares Issued and Outstanding		Liquidation & Carrying Value		Common Stock Issuable Upon Conversion
Series A-1		5,075,000		5,075,000	$	3,570		1,252,438
Series B		11,973,000		11,973,000	$	10,000		3,508,584
Series C		73,598,283		73,598,283	$	22,000		7,718,740
Series D		53,271,754		53,271,754	$	47,300		5,586,959
Series E		112,422,700		112,422,700	$	120,000		11,790,523
Series F		81,587,937		81,587,937	$	105,020		8,556,669

Segment Disclosures (Tables)

12 Months Ended

Dec. 31, 2024

Segment Reporting [Abstract]

Schedule of Selected Financial Information with Respect to Single Operating Segment

The following table presents selected financial information with respect to the Company's single operating segment for the years ended December 31, 2024 and 2023:


	Year Ended December 31,
	2024			2023
Revenue	$	1,139		$	204
Less:
Research and development
Clinical and manufacturing		66,462			35,966
Other research and development(1)		15,640			9,786
Total research and development		82,102			45,752
General and administrative		33,703			9,901
Total operating expenses		115,805			55,653
Loss from operations		(114,666	)		(55,449	)
Other income, net		26,627			6,842
Net loss	$	(88,039	)	$	(48,607	)
(1) Other research and development consists of indirect costs incurred for the benefit of the research and development efforts, including certain personnel, supply chain, and quality assurance.

License and Collaboration Agreements

12 Months Ended

Dec. 31, 2024

License and Collaboration Agreements [Abstract]

License and Collaboration Agreements

Lepu Biotech Co., Ltd.

In March 2019, the Company entered into a development and license agreement with Lepu for cretostimogene (the Lepu License Agreement). Under the terms of the Lepu License Agreement, the Company granted to Lepu an exclusive license to develop, manufacture and commercialize cretostimogene and/or DDM to treat and/or prevent cancer in mainland China, including Hong Kong and Macau (the Lepu Territory). The Company is obligated to use commercially reasonable efforts to supply Lepu with its requirements of cretostimogene and DDM for its development activities at Lepu’s cost and to periodically provide Lepu with manufacturing documentation and, at Lepu’s cost, reasonably requested assistance related to the manufacture of clinical and, if applicable, commercial supplies of cretostimogene and DDM. The Company determined that control of the license was transferred to Lepu on March 2019 upon execution of the contract.

Lepu paid to the Company a one-time upfront payment of $4.5 million and is obligated to make regulatory milestone payments of up to $2.5 million and commercial milestone payments of up to $57.5 million. The Company is entitled to receive a high single-digit royalty on net sales of cretostimogene and/or DDM sold in the Lepu Territory, subject to a specified reduction. Lepu’s royalty obligations will expire upon termination of the Lepu License Agreement.

The Company assessed the Lepu License Agreement in accordance with ASC 606 and determined that the performance obligation is comprised solely of the license grant to Lepu. The Company determined the transaction price was $4.5 million and recorded the entire amount upon transfer of control of the functional intellectual property license rights in 2019. The Company evaluated the provision of manufacturing activities related to clinical and commercial supply of the licensed products and concluded that the manufacturing activities were not performance obligations as the terms do not provide a material right to Lepu.

Future milestone payments are fully contingent as the risk of significant revenue reversal will only be resolved depending on future regulatory approval and sales level outcomes. The Company will re-evaluate the likelihood of achieving future milestones at the end of each reporting period.

The sales-based royalty fee is considered variable consideration and will be recognized as revenue as such sales occur. The sales-based royalty fee qualifies for the royalty constraint exception and does not require an estimate of the future transaction price.

For the years ended December 31, 2024 and 2023, $1.0 million and less than $0.1 million in collaboration and license fee revenue were recorded.

Kissei Pharmaceutical Co., Ltd.

In March 2020, and amended as of September 2022, the Company entered into a license and collaboration agreement with Kissei (the Kissei License Agreement). Under the terms of the Kissei License Agreement, the Company granted to Kissei an exclusive license to certain intellectual property rights in Bangladesh, Bhutan, Brunei, Cambodia, India, Indonesia, Japan, South Korea, Laos, Malaysia, Myanmar, Nepal, Pakistan, Palau, Philippines, Singapore, Sri Lanka, Taiwan, Thailand and Vietnam (the Kissei Territory), for Kissei to develop and commercialize, but not manufacture, cretostimogene in combination with DDM (the Licensed Product) for all uses in oncology indications for which marketing approval is being sought. Under the Kissei Agreement, the Company and Kissei agree to use commercially reasonable efforts to collaborate on clinical development activities in the Kissei Territory and each party is responsible for conducting the applicable activities pursuant to an agreed development plan. Kissei is responsible for the costs of developing the Licensed Product in the Kissei Territory, and the Company is responsible for the costs of developing the Licensed Product outside the Kissei Territory (Global Development), provided that Kissei is responsible for a low-double digit percentage and the Company is responsible for a high-double digit percentage of the cost of development activities that cannot be attributed solely to the Kissei Territory or outside the Kissei Territory. The Company is obligated to supply and Kissei will exclusively purchase its clinical and commercial requirements of Licensed Product from the Company. Kissei is responsible for commercializing the Licensed Product in the Kissei Territory and is obligated to use commercially reasonable efforts to seek regulatory approval for and commercialize at least one Licensed Product in a specified indication. Until a certain period of time has passed after the first regulatory approval of the Licensed Product, the Company is prohibited from commercializing certain competing products worldwide and Kissei is prohibited from researching, developing or commercializing certain competing products worldwide.

Under the terms of the Kissei License Agreement, the Company received a $10.0 million one-time upfront payment and, in connection with entry into this agreement, Kissei purchased $30.0 million worth of Series D redeemable convertible preferred stock as part of the Company’s Series D financing. Kissei is obligated to make development and regulatory milestone payments to the Company of up to $33.0 million and commercial milestone payments of up to $67.0 million. The Company has agreed to pay Kissei a royalty on net sales of Licensed Product outside the Kissei Territory and outside the Lepu Territory (as described above), including on any U.S. sales, in a low-single digit percentage, subject to certain capped reductions. We are entitled to receive a royalty on net sales of Licensed Product in the Kissei Territory in the mid-twenties percentage, subject to certain capped reductions. Also, Kissei has the right to offset the royalty payments due to the Company with respect to the cost for the supply of Licensed Product sold by the Company to Kissei, and to indefinitely carryforward credits for any excess supply amounts paid over royalty amounts owed in a given quarter. The Company is entitled to receive a specified minimum percentage of royalties on net sales of a given Licensed Product in a given country and a given quarter, unless, if for such Licensed Product in such country and such quarter, Kissei has taken the maximum allowable reductions and the ratio of the cost for the supply of Licensed Product to the sales price for Licensed Product exceeds a low-double digit percentage threshold, then the Company shall receive no royalties on the net sales of such Licensed Product in such country and such quarter. Kissei’s and the Company’s royalty obligations will expire on a Licensed Product-by-Licensed Product and country-by-country basis on the later of twelve years from the date of first commercial sale of such Licensed Product in such country or when there is no longer a valid patent claim covering such Licensed Product in such country.

The Kissei Agreement will expire on a Licensed Product-by-Licensed Product and country-by-country basis when there is no remaining royalty or milestone payment obligation due to a party with respect to such Licensed Product in such country. Following expiration of the Kissei Agreement in its entirety, the licenses the Company granted to Kissei will become non-exclusive, fully-paid royalty-free and irrevocable and Kissei will have the right to negotiate directly with our product suppliers for the direct supply of Licensed Product to Kissei. The Kissei Agreement may be terminated either by Kissei or by the Company in the event of an uncured material breach by the other party or in the event the other party becomes subject to specified bankruptcy, insolvency or similar circumstances. In addition, the Company have the right to terminate the Kissei Agreement in the event that Kissei commences a legal action challenging the validity, enforceability or scope of any licensed patents under the Kissei Agreement. Kissei may terminate the Kissei Agreement at will upon specified written notice. Additionally, Kissei may terminate the Kissei Agreement for our willful and malicious misconduct that results in substantial and irreparable harm to the commercial value of the Licensed Products in the Kissei Territory and upon any such termination, the licenses the Company granted to Kissei will become royalty-free and fully paid-up and Kissei will have the right to negotiate directly with our contract manufacturing organizations for the supply of Licensed Product. Upon termination of the Kissei Agreement for any other reason all rights and licenses granted to Kissei to develop and commercialize the product under the Kissei Agreement will terminate, subject to certain rights to sell existing inventory of Licensed Products by Kissei and its sublicensees. Upon termination of the Kissei Agreement for Kissei’s breach, any sublicenses granted by Kissei may, upon the Company’s discretion, continue.

The Company evaluated the Kissei Agreement to determine whether it is a collaborative arrangement in the scope of ASC 808. The Company concluded the Kissei Agreement is a collaborative agreement under ASC 808, as the Kissei Agreement involves a joint operating activity, each party is an active participant in the activities related to the Kissei Agreement, and both parties are exposed to significant risks and rewards dependent upon the commercial success of the activities related to the Kissei Agreement.

The Company determined the Kissei Agreement contained two material components: (i) an exclusive license granted to Kissei to certain intellectual property rights in the Kissei Territory, for Kissei to develop and commercialize, but not manufacture, the Licensed Product for all uses in oncology; and (ii) the parties’ participation in the Global Development of the Licensed Product. The Company used the criteria specified in ASC 606 to determine which of the components of the Kissei Agreement are performance obligations with a customer and concluded Kissei is the Company’s customer for the license and related activities in the Kissei Territory under ASC 606. The Global Development activities under the agreement does not present a transaction with a customer and the payments received by the Company for Global Development activities, including manufacturing, will be accounted for as a reduction of related expenses.

The Company evaluated the Kissei Territory specific license and related activities under ASC 606, as these transactions are considered transactions with a customer, and identified two material promises at the outset of the Kissei License Agreement, which consists of the following: (1) the exclusive license and (2) the manufacturing activities related to development and commercial supply of the Licensed Product in the Kissei Territory. The Company further evaluated the material promise associated with manufacturing activities related to development and commercial supply of the Licensed Products in the Kissei Territory. Given Kissei is not obligated to purchase any minimum amount or quantities of the development and commercial supply from the Company, the Company concluded, for the purpose of ASC 606, the provision of manufacturing activities related to development and commercial supply of the Licensed Product in the Kissei Territory was an option but not a performance obligation of the Company at the inception of the Kissei Agreement and will be accounted for if and when exercised. The Company also concluded there is no separate material right in connection with the development and commercial supply of the licensed product, as the expected pricing was not issued at a significant and incremental discount. Therefore, the manufacturing activities were excluded as performance obligation at the outset of the arrangement.

The Company evaluated the license under ASC 606 and concluded the license is a functional intellectual property license. The Company determined Kissei benefited from the license at the time of grant and, therefore, the related performance obligation was satisfied at a point in time. Additionally, the Company is entitled to development and regulatory milestones as well as sales milestones and royalties from Kissei upon future sales of the Licensed Product in the Kissei Territory. Future milestone payments are fully contingent as the risk of significant reversal will only be resolved depending on future development milestones, regulatory approval and sales level outcomes. The Company re-evaluates the likelihood of achieving future milestones at the end of each reporting period. The royalties are considered variable consideration and will be recognized as revenue as such sales occur. The sales-based royalties qualify for the royalty constrain exception and do not require an estimate of the future transaction price.

As the sale of $30.0 million of the Company’s Series D redeemable convertible preferred stock and the Kissei License Agreement were entered into concurrently and negotiated as a package with a single commercial objective, the Company accounted for the two agreements as a single arrangement for accounting purposes. The total upfront payments of $40.0 million were comprised of $30.0 million attributed to the Series D redeemable convertible preferred stock sold to Kissei and $10.0 million attributed to the functional intellectual property license granted to Kissei. The Company determined that the sale of the Series D redeemable convertible preferred stock of $30.0 million was at fair value and did not include a premium or discount. As a result, $10.0 million of the total upfront payments was allocated to the transaction price of the exclusive license.

For the purposes of ASC 606, the transaction price of the Kissei Agreement as of the outset of the arrangement was determined to be $10.0 million, which consisted of the one-time upfront payment. The other potential milestone payments the Company is eligible to receive were excluded from the transaction price, as all milestone amounts were fully constrained based on the probability of achievement. The Company satisfied the performance obligation upon delivery of the license and recognized the upfront payment of $10.0 million as revenue during the year ended December 31, 2020.

During the year ended December 31, 2021, the Company recognized milestone revenue of $10 million for cash consideration received associated with an achieved development milestone and $0.4 million in development income related to the Kissei License Agreement.

During the years ended December 31, 2024 and 2023, the Company recorded $0.2 million in development income related to the Kissei License Agreement.

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details)) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets:
Net operating losses	$ 34,612	$ 18,015
R&D credit	6,946	4,756
Foreign tax credit	425	424
Operating lease liabilities	50	97
Section 174	12,536	6,998
Other	1,884	266
Total gross deferred tax assets	56,453	30,556
Deferred tax liabilities:
Operating lease right-of-use assets	(46)	(89)
Other	(5)	(10)
Total gross deferred tax liabilities	(51)	(99)
Net deferred tax assets	56,402	30,457
Valuation allowance	(56,402)	(30,457)
Net deferred tax asset	$ 0	$ 0

Employee Stock Purchase Plan - Additional Information (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 11, 2024	Dec. 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of shares issued under ESPP		13,580,666
ESPP
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of shares issued under ESPP	812,242	800,000
Percentage of sale of common stock at fair value	85.00%
Percentage of earnings applied to purchase of stock under ESPP	15.00%
Maximum number of shares per employee (in shares)	100,000
Stock-based compensation expense under ESPP		$ 1.9
Gross unrecognized stock-based compensation cost		$ 2.7
Unrecognized stock-based compensation expense expected to be recognized over weighted-average period		1 year 2 months 4 days
ESPP shares purchased during period (in shares)		29,146

Employee Stock Purchase Plan

12 Months Ended

Dec. 31, 2024

Employee Stock Purchase Plan [Abstract]

Employee Stock Purchase Plan

11.

Employee Stock Purchase Plan

On January 11, 2024, the Company’s board of directors and stockholders approved the 2024 Employee Stock Purchase Plan (the ESPP), which became effective on the date on which the Company’s registration statement with respect to its IPO was declared effective by the SEC. The number of shares initially available for issuance pursuant to the ESPP is 812,242 shares. The ESPP provides for the sale of the Company's common stock to eligible employees at 85% of the fair market value of the Company's common stock at the commencement date of each offering period or the relevant date of purchase, whichever is lower. Payroll deductions are limited to 15% of the employee’s eligible compensation, subject to IRS limits. In addition, employees may not buy more than 100,000 shares during any purchase period or offering period. There were 29,146 shares purchased under the ESPP during the year ended December 31, 2024. As of December 31, 2024, there were approximately 0.8 million shares available for issuance under the ESPP.

The Company recorded stock-based compensation expense under the ESPP of approximately $1.9 million for the year ended December 31, 2024. As of December 31, 2024, the Company had $2.7 million of gross unrecognized stock-based compensation expense under the ESPP to be recognized over a weighted average period of 1.18 years.

Segment Disclosures - Schedule of Selected Financial Information with Respect to Single Operating Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Revenue	$ 1,139	$ 204
Research and development
Total research and development	82,102	45,752
General and administrative	33,703	9,901
Total operating expenses	115,805	55,653
Loss from operations	(114,666)	(55,449)
Other income, net	3	(62)
Net loss and comprehensive loss	(88,039)	(48,607)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	1,139	204
Research and development
Clinical and manufacturing	66,462	35,966
Other research and development	15,640	9,786
Total research and development	82,102	45,752
General and administrative	33,703	9,901
Total operating expenses	115,805	55,653
Loss from operations	(114,666)	(55,449)
Other income, net	26,627	6,842
Net loss and comprehensive loss	$ (88,039)	$ (48,607)

Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ (88,039)	$ (48,607)

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.