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Income Taxes (Details 4) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Components of net deferred tax assets (liabilities) |  |
Depreciation and amortization | $ 6,578 | $ 13,199
Lease liabilities | 7,873 | 8,716
Other timing differences, accruals and reserves | 5,828 | 5,347
Deferred equity compensation | 5,077 | 4,631
Net operating loss carryovers | 14,602 | 15,692
Capitalized research | 22,301 | 0
Tax credits | 130,348 | 168,978
Total gross deferred tax assets | 192,607 | 216,563
Lease right-of-use assets | (5,323) | (6,392)
Convertible debt | (81) | (130)
Deferred revenue | (267) | (45,845)
Total gross deferred tax liabilities | (5,671) | (52,367)
Total net deferred tax assets before valuation allowance | 186,936 | 164,196
Valuation allowance | (206,874) | (174,119)
Net deferred tax liabilities | $ (19,938) | $ (9,923)

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