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Income Taxes (Details 4) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Components of net deferred tax assets (liabilities) |  |
Depreciation and amortization | $ 3,247 | $ 6,578
Lease liabilities | 7,691 | 7,873
Other timing differences, accruals and reserves | 10,393 | 5,747
Deferred equity compensation | 4,366 | 5,077
Net operating loss carryovers | 13,423 | 14,602
Capitalized research | 49,649 | 22,301
Tax credits | 96,758 | 130,348
Total gross deferred tax assets | 185,527 | 192,526
Lease right-of-use assets | (5,501) | (5,323)
Deferred revenue | (76) | (267)
Total gross deferred tax liabilities | (5,577) | (5,590)
Total net deferred tax assets before valuation allowance | 179,950 | 186,936
Valuation allowance | (201,883) | (206,874)
Net deferred tax liabilities | $ (21,933) | $ (19,938)

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