Stock-based Compensation - Additional Information (Details)
$ / shares in Units, $ in Millions |
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1 Months Ended |
6 Months Ended |
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Jun. 17, 2026
shares
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Jun. 06, 2024
USD ($)
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Aug. 18, 2023 |
Apr. 30, 2026
Tranche
$ / shares
shares
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Oct. 31, 2025
Tranche
$ / shares
shares
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Jun. 30, 2024
Tranche
$ / shares
shares
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Aug. 31, 2023
shares
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Jun. 30, 2026
USD ($)
shares
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Jun. 30, 2025
shares
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Dec. 31, 2025
USD ($)
shares
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Number of options exercised |
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542,484
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| Options granted |
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13,971,473
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| Unvested shares issued |
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953,572
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1,173,066
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| Minimum volatility rate |
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80.00%
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| Maximum volatility rate |
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90.00%
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| Unrecognized stock-based compensation expense related to unvested awards | $ |
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$ 159.2
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| Weighted-average period |
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2 years 8 months 19 days
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| Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesNoncurrent |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Early exercise liability | $ |
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$ 1.4
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$ 1.7
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| Minimum |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Fair value, expected term |
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9 years
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| Maximum |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Fair value, expected term |
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10 years
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| Performance-Based and Market-Based Options |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Number of options exercised |
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0
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0
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| Number of shares vested |
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0
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0
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| Modification of Chief Medical Officer Award |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Stock option plan, vesting period |
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24 months
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| Incremental compensation cost | $ |
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$ 7.8
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| Stock option plan, service period |
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36 months
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| Stock option plan, vesting rights percentage |
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80.00%
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| Stock option plan, vesting rights remaining percentage |
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20.00%
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| Number of shares granted |
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3,982,000
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| Restricted Stock Units |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Number of shares granted |
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2,205,481
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| Restricted Stock Units | Service-Based and Performance-Based Vesting Conditions |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Number of shares granted |
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78,748
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| Restricted Stock Units | Employees and Directors That Vest in Full on Two-Year Anniversary of Grant Date |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Number of shares granted |
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2,126,733
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| 2023 Stock Option and Grant Plan |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Stock option plan, Description |
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The Company adopted the 2023 Stock Option and Grant Plan (as amended and restated, the “2023 Plan”) on August 18, 2023. The 2023 Plan remained in effect until June 17, 2026. The 2023 Plan provided for the grant of incentive stock options, non-qualified stock options, restricted stock awards, unrestricted stock awards and restricted stock units to the employees, directors and consultants of the Company. The option exercise price of each option was determined by the administrator of the 2023 Plan and could not be less than 100% of the fair market value of the Company’s common stock on the date of grant, or in the case of an incentive stock option granted to a 10% owner, the exercise price could not be less than 110% of the fair market value of the Company’s common stock on the date of grant. The maximum term of the options granted under the 2023 Plan was no more than ten years. Service-based awards generally vest at 25% one year from the vesting commencement date and ratably each month thereafter for a period of 36 months, subject to continuous service. Performance and market-based awards would have individual vesting conditions. The shares of common stock underlying any awards that are forfeited, cancelled, reacquired by the Company prior to vesting, satisfied without the issuance of stock, or otherwise terminated (other than by exercise), or held back upon exercise or settlement of an award to satisfy the exercise price or tax withholding under the 2023 Plan were added back to the shares of common stock available for issuance under the 2023 Plan and, following June 17, 2026, will be added back to the shares of common stock available for issuance under the 2026 Plan.As of June 30, 2026 and December 31, 2025, the Company had reserved 26,224,708 and 33,752,354 shares of common stock for issuance under the 2023 Plan, respectively. As of June 30, 2026 and December 31, 2025, the number of shares remaining for grant under the 2023 Plan were zero and 4,375,891 shares, respectively.
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| Stock option plan, vesting period |
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1 year
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| Stock option plan, service period |
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36 months
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| Percentage of incentive stock option granted to owner |
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10.00%
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| Stock option plan, vesting rights percentage |
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25.00%
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| Common stock reserved for issuance |
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26,224,708
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33,752,354
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| Number of shares remaining for grant |
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0
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4,375,891
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| 2023 Stock Option and Grant Plan | Maximum |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Stock option plan, vesting period |
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10 years
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| Percentage of fair market value of common stock |
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100.00%
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| Percentage of exercise price of fair market value |
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110.00%
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| 2023 Stock Option and Grant Plan | Modification of Chief Medical Officer Award |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Stock option plan, vesting period |
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36 months
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| Stock option plan, vesting rights percentage |
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50.00%
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| Stock option plan, vesting rights remaining percentage |
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50.00%
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| 2026 Stock Option and Incentive Plan |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Stock option plan, vesting period |
1 year
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| Stock option plan, service period |
36 months
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| Percentage of incentive stock option granted to owner |
10.00%
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| Stock option plan, vesting rights percentage |
25.00%
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| Common stock reserved for issuance |
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10,620,000
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| Percentage of shares of common stock outstanding |
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5.00%
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| Number of shares remaining for grant |
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8,469,613
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| 2026 Stock Option and Incentive Plan | Maximum |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Stock option plan, vesting period |
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10 years
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| Percentage of fair market value of common stock |
100.00%
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| Percentage of exercise price of fair market value |
110.00%
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| 2026 Employee Stock Purchase Plan |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Stock option plan, service period |
6 months
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| Percentage of fair market value of common stock |
85.00%
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| Common stock reserved for issuance |
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1,180,000
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| Percentage of shares of common stock outstanding |
1.00%
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| Shares issued under ESPP |
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0
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| Maximum percentage of eligible compensation to purchase common stock |
15.00%
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| Number of shares provided for issuance |
2,360,000
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| June 2024 Early-exercisable Non-qualified Option |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Options granted |
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4,277,389
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| Price per share | $ / shares |
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$ 1.35
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| Vesting rights description |
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The options vest contingent upon the satisfaction of the service, performance and market conditions.
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| June 2024 Early-exercisable Non-qualified Option | Service Condition |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Vesting rights description |
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The service condition is satisfied if the optionee maintains continuous service as the Company’s Chief Executive Officer through June 6, 2027.
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| June 2024 Early-exercisable Non-qualified Option | Market Condition |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Vesting rights description |
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The market condition is structured in five tranches, under which certain percentage of the options vest upon the Company achieving market valuation thresholds at specified levels.
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| Number of tranches | Tranche |
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5
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| June 2024 Early-exercisable Non-qualified Option | Performance Condition |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Vesting rights description |
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The performance condition applies only to 932,676 shares and is satisfied upon the occurrence of specified acquisition by a predetermined date. This performance condition has been met upon the closing of the license agreement with BMS
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| Number of shares vested |
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932,676
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| October 2025 Early-exercisable Non-qualified Option |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Options granted |
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1,400,974
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| Price per share | $ / shares |
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$ 5.8
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| Vesting rights description |
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vesting tied to specific service and market conditions.
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| October 2025 Early-exercisable Non-qualified Option | Service Condition |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Vesting rights description |
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The service condition is satisfied if the optionee maintains continuous service as the Company’s Chief Executive Officer through June 6, 2027.
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| October 2025 Early-exercisable Non-qualified Option | Market Condition |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Vesting rights description |
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The market condition is structured in four tranches, under which certain percentage of the options vest upon the Company achieving market valuation thresholds at specified levels.
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| Number of tranches | Tranche |
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4
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4
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| April 2026 Early-exercisable Non-qualified Option |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Options granted |
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7,268,112
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| Price per share | $ / shares |
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$ 9.42
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| Vesting rights description |
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vesting tied to specific service and market conditions
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| April 2026 Early-exercisable Non-qualified Option | Service Condition |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Vesting rights description |
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The service condition is satisfied if the optionee maintains continuous service relationship with the Company.
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| April 2026 Early-exercisable Non-qualified Option | Market Condition |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
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| Vesting rights description |
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The market condition is structured in four tranches, under which certain percentage of the options vest upon the Company achieving market valuation thresholds at specified levels.
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