DEBT - Unsecured Convertible Promissory Note (Details)
3 Months Ended 6 Months Ended
Mar. 08, 2019
USD ($)
day
$ / shares
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Short-term Debt [Line Items]        
Amortization of debt discount     $ 382,212 $ 1,171,985
Unsecured Convertible Promissory Note        
Short-term Debt [Line Items]        
Principal amount   $ 5,500,000 5,500,000  
Conversion price (in usd per share) | $ / shares $ 3.25      
Redemption price, percentage 115.00%      
Proceeds from notes payable     5,000,000  
Unamortized discount $ 500,000      
Financing costs 20,000      
Debt issuance costs 37,000      
Debt discount and derivative liability at the issuance date $ 1,300,000      
Amortization of debt discount   $ 300,000 $ 400,000  
Debt interest rate 10.00%      
Interest rate upon default 18.00%      
Threshold trading days | day 20      
Stock price trigger (in usd per share) | $ / shares $ 10.00      
Percentage of the VWAP 80.00%      
Debt instrument, cap rate 19.99%      
Unsecured Convertible Promissory Note | Debt Instrument, Redemption, Period One        
Short-term Debt [Line Items]        
Debt instrument, redemption period 15 months      
Redemption price $ 500,000      
Unsecured Convertible Promissory Note | Debt Instrument, Redemption, Period Two        
Short-term Debt [Line Items]        
Debt instrument, redemption period 6 months      
Redemption price $ 750,000      
Unsecured Convertible Promissory Note | Minimum        
Short-term Debt [Line Items]        
Event of default rate of increase in outstanding obligations 5.00%      
Unsecured Convertible Promissory Note | Maximum        
Short-term Debt [Line Items]        
Event of default rate of increase in outstanding obligations 15.00%