DEBT - Unsecured Convertible Promissory Note (Details)
3 Months Ended 6 Months Ended
Apr. 03, 2020
USD ($)
Mar. 08, 2019
USD ($)
day
$ / shares
Jun. 30, 2020
USD ($)
$ / shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Short-term Debt [Line Items]              
Amortization of debt discount         $ (1,154,847) $ (382,212)  
Repayments of debt         1,469,804 6,245,833  
Unsecured Convertible Promissory Note              
Short-term Debt [Line Items]              
Principal amount   $ 5,500,000 $ 8,400,000   $ 8,400,000   $ 5,500,000
Conversion price (in dollars per share) | $ / shares   $ 3.25 $ 0.45   $ 0.45    
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     $ (400,000) $ (300,000) $ (800,000) (400,000)  
Debt interest rate   10.00%          
Interest rate upon default   18.00%          
Repayments of debt       $ 0 2,000,000 $ 0  
Repayments of debt, portion paid in cash         1,500,000    
Repayments of debt, portion paid in stock conversions         500,000    
Accrued interest         $ 100,000    
Common stock, shares, issued (in shares) | shares         1,287,696    
Conversion discount         26.00%    
Conversion feature         $ 200,000    
Threshold trading days | day   20          
Stock price trigger (in dollars per share) | $ / shares   $ 10.00          
Percentage of the VWAP   80.00%          
Debt instrument, cap rate   19.99%          
Unsecured Convertible Promissory Note | Standstill Agreement              
Short-term Debt [Line Items]              
Increase in outstanding balance $ 150,000            
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%