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STOCKHOLDERS' EQUITY - Outstanding Warrants (Details) - Warrant - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Number of warrants    
Number of shares, Beginning 424,708  
Number of shares, granted 0  
Number of shares, Forfeited (22,188)  
Number of shares, Ending 402,520 424,708
Wtd Avg. Exercise Price    
Outstanding (in dollars per share) $ 5.31  
Forfeited (in dollars per share) 9.59  
Outstanding (in dollars per share) $ 5.07 $ 5.31
Wtd Avg. Remaining Term    
Outstanding 7 months 10 days 9 months 26 days
Intrinsic Value of Warrants    
Outstanding $ 189,450  
Granted 0  
Outstanding $ 130,400 $ 189,450