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COMMON STOCK - Warrants (Details) - shares
 9 Months Ended
Oct. 06, 2020
Sep. 30, 2020
Sep. 30, 2019
Class of Warrant or Right [Line Items]      
Warrants outstanding at beginning of period   186,182 197,621
Issued   0 0
Expired   0 0
Warrants outstanding at end of period   186,182 197,621
Lincoln Park      
Class of Warrant or Right [Line Items]      
Issued 118,799    
Warrants exercised (in shares) 182,515