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INCOME TAXES - Reconciliation of taxes at the federal statutory rate to our provision for income taxes (Details)
12 Months Ended
Dec. 22, 2017
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of taxes at the federal statutory rate to our provision for income taxes      
Statutory federal income tax rate 35.00% 21.00% 21.00%
Share-based compensation   (0.20%) (0.20%)
Mark-to-market adjustment   (3.40%) (1.10%)
Nondeductible expenses   (0.10%) (0.80%)
Tax credits   2.80% 1.90%
Change in valuation allowance   (20.10%) (20.80%)