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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 $ 13,805
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 15,692 20,836
Tax credits 168,978 232,787
Total gross deferred tax assets 216,563 292,140
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 164,196 186,826
Valuation allowance (174,119) (196,098)
Net deferred tax liabilities $ (9,923) $ (9,272)