Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY - Stock Warrants (Details)

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STOCKHOLDERS' EQUITY - Stock Warrants (Details) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Class of Warrant or Right [Line Items]      
Exercise Price (in dollars per share) $ 5.23 $ 5.23 $ 4.95
Outstanding number of warrants (in shares) 5,993,275 5,993,275 1,138,557
Weighted Average Remaining Life, Outstanding (in years) 4 years 6 months 4 years 7 months 6 days  
Exercisable number of warrants (in shares) 5,452,953 5,452,953  
Warrant Exercise Price $ 4.20      
Class of Warrant or Right [Line Items]      
Exercise Price (in dollars per share) $ 4.20 $ 4.20  
Outstanding number of warrants (in shares) 1,235,997 1,235,997  
Weighted Average Remaining Life, Outstanding (in years)   3 years 7 months 6 days  
Exercisable number of warrants (in shares) 857,141 857,141  
Warrant Exercise Price $ 4.95      
Class of Warrant or Right [Line Items]      
Exercise Price (in dollars per share) $ 4.95 $ 4.95  
Outstanding number of warrants (in shares) 177,223 177,223  
Weighted Average Remaining Life, Outstanding (in years)   2 years 6 months  
Exercisable number of warrants (in shares) 177,223 177,223  
Warrant Exercise Price $ 5.50      
Class of Warrant or Right [Line Items]      
Exercise Price (in dollars per share) $ 5.50 $ 5.50  
Outstanding number of warrants (in shares) 4,455,055 4,455,055  
Weighted Average Remaining Life, Outstanding (in years)   4 years 9 months 18 days  
Exercisable number of warrants (in shares) 4,418,589 4,418,589  
Warrant Exercise Price $ 6.25      
Class of Warrant or Right [Line Items]      
Exercise Price (in dollars per share) $ 6.25 $ 6.25  
Outstanding number of warrants (in shares) 125,000 125,000  
Weighted Average Remaining Life, Outstanding (in years)   0 years