Quarterly report pursuant to Section 13 or 15(d)

CONVERTIBLE PROMISSORY NOTES - Narrative (Details)

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CONVERTIBLE PROMISSORY NOTES - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Aug. 31, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Aug. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Short-term Debt [Line Items]                
Proceeds from issuance of convertible promissory notes           $ 0 $ 7,397,000  
Warrant liability   $ 1,500,000            
Derivative liability, fair value   $ 1,400,000            
Convertible Promissory Notes                
Short-term Debt [Line Items]                
Stated rate   12.00%            
Debt term   1 year            
Proceeds from issuance of convertible promissory notes         $ 7,400,000      
Conversion price (in usd per share) $ 7.54       $ 7.54      
Coverage percent   50.00%            
Stock issuable upon warrants (in shares)   490,683            
Warrants term           5 years    
Exercise price (in usd per share)   $ 10.36            
Interest expense     $ 0 $ 1,100,000   $ 0 2,000,000.0  
Accretion of discounts       $ 400,000     $ 800,000  
Effective rate               12.00%
Convertible Promissory Notes | Common Stock                
Short-term Debt [Line Items]                
Shares issued in conversion (in shares) 1,069,740              
Officers and Directors | Convertible Promissory Notes                
Short-term Debt [Line Items]                
Proceeds from issuance of convertible promissory notes         $ 1,700,000