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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)

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Effective Income Tax Rate Reconciliation, Non-deductible Expense, Unbenefited Losses

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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