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Income Taxes - Schedule of Significant Components of Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Components of Deferred Tax Assets and Liabilities [Abstract]    
Federal and state net operating loss carryforwards $ 206,365 $ 175,258
Tax credit carryforwards 129,320 123,156
Foreign net operating loss carryforwards 120 157
Capitalized research and development expenses 83,329 81,697
Stock-based compensation 6,365 7,269
Lease obligations 22 16,508
Reserves and accruals 4,418 5,475
Deferred revenue 7,785 10,038
Intangible assets 15,036 16,517
Other 0 5
Subtotal 452,760 436,080
Less: Valuation allowance (452,740) (426,355)
Net deferred tax assets 20 9,725
Fixed assets (20) (9,725)
Non-deductible accrued expenses 0 0
Net deferred tax liabilities (20) (9,725)
Total net deferred tax assets $ 0 $ 0