INCOME TAXES - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income tax (benefit) provision at the federal statutory rate of 21%	$ (21,527)	$ (4,058)	$ 7,066
State income taxes, net of effect of federal tax benefit	(1,379)	1,641	2,693
Stock-based compensation	(10,331)	(2,914)	(12,768)
Unbenefited losses	4,481	2,899	1,523
Change in judgement on beginning of the year valuation allowance	(4,165)	(3,544)	0
Research credit	(2,431)	(2,494)	(3,308)
Deferred tax adjustment for enacted changes in tax law and rates	768	(5,244)	502
Net adjustment related to the reconciliation of income tax provision accruals to tax returns	335	(743)	448
Other, net	2,236	(711)	2,176
Income tax benefit	$ (32,013)	$ (15,168)	$ (1,668)