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INCOME TAXES - Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Income tax (benefit) provision at the federal statutory rate of 21% $ (4,058) $ 7,066 $ 14,705
State income taxes, net of effect of federal tax benefit 1,641 2,693 4,702
Deferred tax adjustment for enacted changes in tax law and rates (5,244) 502 (1,431)
Change in judgement on beginning of the year valuation allowance (3,544)    
Stock-based compensation (2,914) (12,768) (25,184)
Unbenefited losses 2,899 1,523 2,227
Research credit (2,494) (3,308) (1,169)
Net adjustment related to the reconciliation of income tax provision accruals to tax returns (743) 448 (1,669)
Other, net (711) 2,176 336
Income tax benefit $ (15,168) $ (1,668) $ (7,483)