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INCOME TAXES, STATUTORY INCOME TAX RATES (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income tax benefits computed using the federal statutory income tax rate    
Statutory rate (21.00%) (21.00%)
State taxes, net of benefit (5.80%) (5.70%)
Permanent differences:    
Warrant modification expense   1.20%
Other 0.30% 0.40%
Research and development tax credit (1.10%) (1.40%)
Stock-based compensation 21.20%  
Other   1.20%
Increase / (decrease) in valuation reserve 6.40% 25.30%
Effective tax rate 0.00% 0.00%