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Income Taxes (Details 4) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Components of net deferred tax assets (liabilities) |  |
Depreciation and amortization | $ 13,199 | $ 13,995
Lease liabilities | 8,716 | 10,734
Other timing differences, accruals and reserves | 5,347 | 9,522
Deferred equity compensation | 4,631 | 4,456
Net operating loss carryovers | 15,756 | 20,900
Tax credits | 169,063 | 233,407
Total gross deferred tax assets | 216,712 | 293,014
Lease right-of-use assets | (6,392) | (10,400)
Convertible debt | (130) | (151)
Deferred revenue | (45,845) | (94,763)
Total gross deferred tax liabilities | (52,367) | (105,314)
Total net deferred tax assets before valuation allowance | 164,345 | 187,700
Valuation allowance | (174,328) | (196,972)
Net deferred tax liabilities | $ (9,983) | $ (9,272)

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