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Income Taxes (Reconciliation of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Net operating loss carryforwards $ 378,035 $ 233,225
Research and development credits 60,672 49,179
Accruals and reserves 10,822 6,337
Stock-based compensation 12,838 9,717
ASC842 Operating lease liability (13,105) (9,870)
Total deferred tax assets 475,472 308,328
Less: Valuation allowance (366,940) (300,505)
Total deferred tax assets: 108,532 7,823
Intangibles (97,345)  
Fixed assets (1,523) (786)
ASC842 Operating Lease right-of-use assets (10,502) (7,037)
Total deferred tax liabilities (109,370) (7,823)
Net deferred tax liabilities $ (838)