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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Deferred Tax Assets, Gross [Abstract]    
Net operating loss carryforwards $ 139,120 $ 56,677
Capitalized research and development 103,127 94,002
Research and development tax credit carryforwards 82,361 52,117
Change in fair value of related party revenue share liability 19,284 4,785
Stock-based compensation 14,225 9,705
Other 4,648 2,714
Total gross deferred tax assets 362,765 220,000
Valuation allowance (362,495) (220,000)
Total net deferred tax assets 270 0
Deferred tax liabilities    
Other (270) 0
Total gross deferred tax liabilities 270 0
Net deferred tax assets $ 0 $ 0