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NOTES PAYABLE - Narrative (Details) - USD ($)
6 Months Ended 29 Months Ended
Sep. 03, 2019
Jun. 02, 2018
Feb. 18, 2016
Jun. 30, 2020
Jun. 30, 2019
Jul. 31, 2018
Apr. 15, 2020
Debt Instrument [Line Items]              
Payments of principal of note payable $ (2,600,000)     $ 0 $ (1,609,000)    
Payment of associated accrued interest and aggregate end-of-term payment $ 600,000            
Paycheck Protection Program              
Debt Instrument [Line Items]              
Face amount             $ 400,000
Stated rate             1.00%
Note Payable              
Debt Instrument [Line Items]              
Face amount     $ 7,500,000        
Facility fees           $ 200,000  
Interest Rate Option 1 | Note Payable              
Debt Instrument [Line Items]              
Stated rate     9.20%        
Interest Rate Option 2 | Note Payable              
Debt Instrument [Line Items]              
Stated rate     9.20%        
Interest Rate Option 2 | Note Payable | Prime Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate     3.50%        
Hercules Capital Warrants              
Debt Instrument [Line Items]              
Warrants converted (in shares)   9,005          
Exercise price (in usd per share)   $ 33.31