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INCOME TAXES - Reconciliation of Effective Tax Rate (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Percent
Statutory rate	21.00%	21.00%	21.00%
State tax	4.70%	20.20%	42.50%
Research and development (R&D) credit	5.10%	2.50%	12.60%
Rate differentials for controlled foreign corporations (CFCs) and charitable organizations that affect valuation allowance	(1.90%)	0.60%	(2.80%)
Permanent items and others	1.00%	3.50%	(11.20%)
Stock-based compensation - federal	16.50%	110.10%	(13.40%)
Change in valuation allowance - federal	(18.10%)	0.00%	133.20%
162(m) limitation	(27.00%)	0.00%	0.00%
Total	1.30%	157.90%	181.90%

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Effective Income Tax Rate Reconciliation, Limitation Imposed By Internal Revenue Code, Percent

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

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

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Percentage 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 changes in the valuation allowance for deferred tax assets.

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