Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Reconciliation of income tax provision relative to continuing operations (Details)

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INCOME TAXES - Reconciliation of income tax provision relative to continuing operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Percent [Abstract]    
Federal income tax expense (benefit) at U.S. statutory rate 21.00% 21.00%
State taxes, net of federal benefit (567.30%) 10.20%
Change in valuation allowance 265.50% (32.00%)
Permanent differences 221.80% (3.70%)
Credits (118.20%) 2.70%
Other 9.90% 0.40%
Effective Income Tax Rate Reconciliation, Percent, Total (167.30%) (1.40%)
Effective Income Tax Rate Reconciliation, Amount [Abstract]    
Federal income tax expense (benefit) at U.S. statutory rate $ 12 $ (1,206)
State taxes, net of federal benefit (312) (587)
Change in valuation allowance 146 1,836
Permanent differences 122 215
Credits (65) (156)
Other 5 (22)
Income Tax Expense (Benefit), Total $ (92) $ 80