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STOCKHOLDERS' EQUITY - Stock option activity (Details) - $ / shares
9 Months Ended 12 Months Ended
Feb. 28, 2020
Sep. 30, 2020
Dec. 31, 2019
Shares      
Outstanding   4,218,189  
Granted 1,041,325 1,593,825  
Forfeited   (31,644)  
Expired   (224,047)  
Exercised   (321,375)  
Outstanding   5,234,948 4,218,189
Weighted Average Exercise Price per Share      
Outstanding   $ 6.16  
Granted   6.18  
Forfeited   7.33  
Expired   5.60  
Exercised   4.35  
Outstanding   $ 6.36 $ 6.16
Weighted Average Remaining Contractual Life (Years)      
Outstanding     7 years
Granted   9 years 3 months 18 days  
Outstanding   7 years 4 months 24 days