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INCOME TAXES - Reconciliation of tax rates (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]    
Statutory federal tax rate - expense (benefit) 21.00% 21.00%
Foreign rate differential 5.00% (1.00%)
Nondeductible permanent items (1.00%) 0.00%
Expired tax attributes 4.00% 0.00%
Derivative fair value adjustment 5.00% 11.00%
Valuation allowance (21.00%) (33.00%)
Other 1.00% 1.00%
Effective income tax rate 14.00% (1.00%)