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STOCK-BASED COMPENSATION - Stock Option Activity (Details)
 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
$ / shares
shares
Number of Shares, Exercised (1,456)  
Stock option    
Number of Shares Outstanding, Beginning Balance 6,001,814  
Number of Shares, Granted 1,620,000  
Number of Shares, Exercised (1,456)  
Number of Shares, Cancelled / Expired (159,581)  
Number of Shares Outstanding, Ending Balance 7,460,777 6,001,814
Number of Shares, Options vested and exercisable 3,396,723  
Weighted Average Exercise Price per Share Outstanding, Beginning Balance | $ / shares $ 6.22  
Weighted Average Exercise Price per Share, Granted | $ / shares 3.06  
Exercise price | $ / shares 2.12  
Weighted Average Exercise Price per Share, Cancelled / Expired | $ / shares 3.42  
Weighted Average Exercise Price per Share Outstanding, Ending Balance | $ / shares 5.59 $ 6.22
Weighted Average Exercise Price, Options vested and exercisable | $ / shares $ 6.91  
Total Intrinsic Value Outstanding | $ $ 1,178,000  
Total Intrinsic Value, Options vested and exercisable | $ $ 299,000  
Weighted Average Remaining Contractual Life, Outstanding 8 years 1 month 6 days 8 years 3 months 18 days
Weighted Average Remaining Contractual Life, Options granted 9 years 3 months 18 days  
Weighted Average Remaining Contractual Life, Options vested and exercisable 7 years 6 months