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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Cash and cash equivalents | $ 75,670 | $ 88,334
U.S. Treasury securities | 281,701 | 154,484
Restricted cash | 1,277 | 1,097
Total assets measured at fair value | 358,648 | 243,915
Contingent consideration | (21) | (22)
Related-party convertible note payable at fair value | (774,350) | (477,093)
Warrant liabilities | (352,383) | (84,417)
RIPA derivative liabililty | (23,700) | (19,400)
Stock option purchase liability | (306) | (322)
Total liabilities measured at fair value | (1,150,760) | (581,254)
Level 1 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Cash and cash equivalents | 75,670 | 88,334
U.S. Treasury securities | 281,701 | 154,484
Restricted cash | 1,277 | 1,097
Total assets measured at fair value | 358,648 | 243,915
Contingent consideration | 0 | 0
Related-party convertible note payable at fair value | 0 | 0
Warrant liabilities | 0 | 0
RIPA derivative liabililty | 0 | 0
Stock option purchase liability | 0 | 0
Total liabilities measured at fair value | 0 | 0
Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Cash and cash equivalents | 0 | 0
U.S. Treasury securities | 0 | 0
Restricted cash | 0 | 0
Total assets measured at fair value | 0 | 0
Contingent consideration | 0 | 0
Related-party convertible note payable at fair value | 0 | 0
Warrant liabilities | 0 | 0
RIPA derivative liabililty | 0 | 0
Stock option purchase liability | 0 | 0
Total liabilities measured at fair value | 0 | 0
Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Cash and cash equivalents | 0 | 0
U.S. Treasury securities | 0 | 0
Restricted cash | 0 | 0
Total assets measured at fair value | 0 | 0
Contingent consideration | (21) | (22)
Related-party convertible note payable at fair value | (774,350) | (477,093)
Warrant liabilities | (352,383) | (84,417)
RIPA derivative liabililty | (23,700) | (19,400)
Stock option purchase liability | (306) | (322)
Total liabilities measured at fair value | $ (1,150,760) | $ (581,254)

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