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
Mar. 31, 2021
Dec. 31, 2020
Share-based Compensation, Stock Options, Activity [Line Items]    
Outstanding - Number of Shares Issuable Upon Exercise of Outstanding Options 1,184,464  
Granted - Number of Shares Issuable Upon Exercise of Outstanding Options 208,500  
Outstanding - Number of Shares Issuable Upon Exercise of Outstanding Options 1,392,964  
Exercisable - Number of Shares Issuable Upon Exercise of Outstanding Options 549,134  
Unvested - Number of Shares Issuable Upon Exercise of Outstanding Options 843,830  
Outstanding - Weighted Average Exercise Price (in dollars per share) $ 4.34  
Granted - Weighted Average Exercise Price (in dollars per share) 1.78  
Outstanding - Weighted Average Exercise Price (in dollars per share) 3.96  
Exercisable - Weighted Average Exercise Price (in dollars per share) 7.32  
Unvested - Weighted Average Exercise Price (in dollars per share) $ 1.77  
Outstanding - Weighted Average Remaining Contracted Term in Years 8 years 6 months 22 days  
Exercisable - Weighted Average Remaining Contracted Term in Years 7 years 7 months 17 days  
Unvested - Weighted Average Remaining Contracted Term in Years 9 years 2 months 1 day  
Outstanding - Aggregate Intrinsic Value $ 122,700 $ 316,688
Exercisable - Aggregate Intrinsic Value (in dollars) 1,100  
Unvested - Aggregate Intrinsic Value (in dollars) $ 121,600