Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION - Stock Option Activity (Details)

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STOCK-BASED COMPENSATION - Stock Option Activity (Details) - Stock Option Activity [Member] - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Share-based Compensation, Stock Options, Activity [Line Items]    
Outstanding - Number of Shares Issuable Upon Exercise of Outstanding Options 610,714  
Granted - Number of Shares Issuable Upon Exercise of Outstanding Options 273,750  
Outstanding - Number of Shares Issuable Upon Exercise of Outstanding Options 884,464 610,714
Exercisable - Number of Shares Issuable Upon Exercise of Outstanding Options 311,799  
Unvested - Number of Shares Issuable Upon Exercise of Outstanding Options 572,665  
Outstanding - Weighted Average Exercise Price (in dollars per share) $ 6.78  
Granted - Weighted Average Exercise Price (in dollars per share) 2.58  
Outstanding - Weighted Average Exercise Price (in dollars per share) 5.48 $ 6.78
Exercisable - Weighted Average Exercise Price (in dollars per share) 10.95  
Unvested - Weighted Average Exercise Price (in dollars per share) $ 2.50  
Outstanding - Weighted Average Remaining Contracted Term in Years 8 years 11 months 19 days 8 years 9 months 29 days
Exercisable - Weighted Average Remaining Contracted Term in Years 8 years 2 months 23 days  
Unvested - Weighted Average Remaining Contracted Term in Years 9 years 4 months 13 days  
Outstanding - Aggregate Intrinsic Value $ 500 $ 34,750
Exercisable - Aggregate Intrinsic Value (in dollars) 0  
Unvested - Aggregate Intrinsic Value (in dollars) $ 500