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INCOME TAXES - Schedule of Difference in Benefit for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Federal statutory rate				21.00%	21.00%	21.00%
Tax at statutory rate				$ 8,043	$ 6,254	$ 1,268
State income taxes, net of federal benefit				1,615	1,008	(89)
Change in valuation allowance	$ (54,966)	$ (248)	$ (2,137)	(61,317)	(4,420)	(1,613)
Federal effect of change in state valuation allowance				3,803	0	0
Deductible stock awards				(3,790)	(6,004)	(2,048)
Deferred tax adjustments				(2,047)	0	0
Non-deductible expenses				656	638	633
Non-deductible officer compensation				487	1,359	2,214
Tax credits				(130)	(82)	(686)
Other, net				(124)	(627)	(63)
Benefit for income taxes				$ (52,804)	$ (1,874)	$ (384)

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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