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Income Taxes (Reconciliation of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets:    
Net operating loss carryforwards $ 400,629 $ 378,035
Research and development credits 71,526 60,672
Capitalized research and experimental expenses 34,863  
Accruals and reserves 18,417 10,822
Stock-based compensation 17,117 12,838
ASC842 Operating lease liability 11,537 13,105
Total deferred tax assets 554,089 475,472
Less: Valuation allowance (445,574) (366,940)
Total deferred tax assets: 108,515 108,532
Intangibles (98,931) (97,345)
Fixed assets (1,262) (1,523)
ASC 842 Operating Lease right-of-use assets (9,157) (10,502)
Total deferred tax liabilities (109,350) (109,370)
Net deferred tax liabilities $ (835) $ (838)