INCOME TAXES - Income Tax Reconciliation (Details)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
US federal statutory tax rate	21.00%	21.00%	21.00%
State and local income taxes net of federal tax benefit	(29.50%)	(0.50%)	2.40%
Valuation allowance	(29.90%)	(13.40%)	0.00%
Stock-based compensation	6.70%	0.00%	0.00%
Non-deductible compensation	(16.30%)	(0.70%)	0.00%
Changes in uncertain tax positions	0.00%	0.00%	14.70%
Non-deductible expenses	(8.20%)	(2.80%)	(7.50%)
Other, net	2.20%	(0.70%)	(0.30%)
Effective income tax rate	(54.00%)	2.90%	30.30%

Effective Income Tax Rate Reconciliation, Uncertain Tax Position, Percent

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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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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Percentage 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 nondeductible expense for share-based payment arrangement.

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Percentage 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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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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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