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Income Taxes - Components of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Deferred tax assets:    
Net operating loss carryforwards $ 404,212 $ 149,735
Stock-based compensation 16,920 28,586
Lease liability 5,634 6,206
Capitalized research and development costs 156,429 268,232
Research and development credits 199,017 124,116
Other 12,103 13,351
Gross deferred tax assets 794,315 590,226
Valuation allowance (779,030) (572,894)
Total deferred tax assets, net of valuation allowance 15,285 17,332
Deferred tax liabilities:    
Right-of-use asset (4,941) (5,436)
Acquired intangibles (3,556) (9,727)
Total deferred tax liabilities (8,497) (15,163)
Net deferred tax assets (liabilities) $ 6,788 $ 2,169