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RELATED PARTY TRANSACTIONS - Narrative (Details) - USD ($)
12 Months Ended
Apr. 29, 2019
Apr. 25, 2019
Mar. 18, 2019
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]          
Number of shares issued on transaction (in shares) 4,318,272   4,181,068 8,499,340  
Shares issued, purchase price per share (in dollars per share) $ 2.025   $ 2.33    
Number of securities called by each warrant (in shares)   3,897,010   15,120,898  
Issuance of common stock       $ 20,219,756 $ 16,182,002
Exercise price of warrants or rights (in dollars per share)   $ 2.13      
Purchase price of each additional warrant (in dollars per share)   $ 0.125      
Warrant term   5 years      
Exercise commencement period   6 months      
Executive Consultant          
Related Party Transaction [Line Items]          
Consulting and legal fees paid to related parties       115,000 31,000
Amount due to executive officer       $ 0 $ 31,000
Former Chief Executive Officer          
Related Party Transaction [Line Items]          
Number of securities called by each warrant (in shares) 46,638        
Issuance of common stock     $ 116,500    
Short-Term Warrants          
Related Party Transaction [Line Items]          
Number of securities called by each warrant (in shares)     4,181,068    
Exercise price of warrants or rights (in dollars per share)     $ 4.00    
Warrant term     1 year    
Short-Term Warrants | Former Chief Executive Officer          
Related Party Transaction [Line Items]          
Number of securities called by each warrant (in shares)     50,000    
Exercise price of warrants or rights (in dollars per share)     $ 4.00    
Long-Term Warrants          
Related Party Transaction [Line Items]          
Number of securities called by each warrant (in shares)     2,508,634    
Exercise price of warrants or rights (in dollars per share)     $ 2.56    
Warrant term     5 years    
Long-Term Warrants | Former Chief Executive Officer          
Related Party Transaction [Line Items]          
Number of shares issued on transaction (in shares)     30,000    
Exercise price of warrants or rights (in dollars per share)     $ 2.56    
Common Stock | Former Chief Executive Officer          
Related Party Transaction [Line Items]          
Number of shares issued on transaction (in shares)     50,000