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INCOME TAXES - Schedule of Difference Between Benefit for Income Taxes and Federal Statutory Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Tax at federal statutory rate	$ (37,372)	$ (25,363)	$ (20,038)
State taxes, net	(6,734)	(3,168)	(9,597)
Foreign rate differential	362	376	(665)
Global Intangible Low-taxed Income	637	1,335	0
Non-deductible stock-based compensation	2,770	4,232	2,817
Research credits	(5,230)	(3,657)	(3,429)
Change in valuation allowance	45,373	26,537	29,655
Other	500	53	1,257
Income tax expense	$ 306	$ 345	$ 0

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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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