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Income Taxes - Summary of deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Gross deferred tax assets    
Net operating loss carryforwards $ 197,618 $ 188,255
Tax credit carryforwards 56,830 50,688
Deferred research and development expenses 82,077 67,494
Stock-based compensation 14,671 9,993
Fixed assets 1,019 1,193
Accrued expenses and other 398 373
Deferred tax assets, gross 352,613 317,996
Gross deferred tax liabilities    
IPR&D intangibles (6,840) (6,840)
Total deferred tax assets and liabilities 345,773 311,156
Valuation allowance (347,386) (312,769)
Net deferred tax liability $ (1,613) $ (1,613)