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Income Taxes - Summary of deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Gross deferred tax assets    
Net operating loss carryforwards $ 176,816 $ 197,618
Tax credit carryforwards 24,718 56,830
Deferred research and development expenses 101,047 82,077
Stock-based compensation 20,940 14,671
Fixed assets 1,033 1,019
Accrued expenses and other 429 398
Deferred tax assets, gross 324,983 352,613
Gross deferred tax liabilities    
IPR&D intangibles (6,840) (6,840)
Total deferred tax assets and liabilities 318,143 345,773
Valuation allowance (319,756) (347,386)
Net deferred tax liability $ (1,613) $ (1,613)