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STOCKHOLDERS' EQUITY - Restricted stock units, Additional Information (Details) - USD ($)
9 Months Ended
Aug. 19, 2019
Jun. 03, 2019
Mar. 15, 2019
Sep. 30, 2019
Class of Stock [Line Items]        
Vesting term   3 years    
Restricted Stock Units (RSUs) [Member]        
Class of Stock [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   20,000   158,845
Fair value of the RSUs at grant date $ 95,697 $ 130,600 $ 528,277  
Restricted Stock Units (RSUs) [Member] | Vest on June 3, 2020        
Class of Stock [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   26,967    
Restricted Stock Units (RSUs) [Member] | Vest on June 3, 2021        
Class of Stock [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   26,967    
Restricted Stock Units (RSUs) [Member] | Vest on June 3, 2022        
Class of Stock [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   26,966    
Restricted Stock Units (RSUs) [Member] | Director [Member]        
Class of Stock [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   11,280    
Fair value of the RSUs at grant date   $ 220,975    
Restricted Stock Units (RSUs) [Member] | Sachin Barot        
Class of Stock [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   80,900    
Vesting term   3 years    
Restricted Stock Units (RSUs) [Member] | Joel Horwitz [Member]        
Class of Stock [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 24,105