INCOME TAXES - Reconciliation of effective tax rate to the statutory federal rate (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Federal statutory rate	$ (34,916)	$ (13,857)
Permanent items	5,118	338
State and local taxes, net of federal taxes	(7,110)	(3,560)
Deferred rate changes	6	(17)
Foreign operations	3	0
Valuation allowance	36,042	16,441
Deferred rate changes	910	663
Provision for income taxes	$ 53	$ 8	$ 50
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal statutory rate	21.00%	21.00%
Permanent items	(3.08%)	(0.51%)
State and local taxes, net of federal taxes	4.28%	5.39%
Deferred rate changes	0.00%	0.03%
Foreign operations	0.00%	0.00%
Valuation allowance	(21.68%)	(24.91%)
Deferred rate changes	(0.55%)	(1.00%)
Effective tax rate	(0.03%)	0.00%

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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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 statutory income tax expense (benefit) outside of the country of domicile.

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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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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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