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NOTES PAYABLE - 2020 and 2021 Credit Agreements (Details) - Line of Credit - USD ($)
Jan. 31, 2021
May 31, 2020
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]        
Proceeds from credit agreement   $ 25,000,000.0    
2020 Credit Agreement        
Debt Instrument [Line Items]        
Fixed interest rate, annual   12.00%    
Fixed interest rate, paid in cash   8.00%    
Fixed interest rate, added back to principal   4.00%    
Outstanding balance     $ 25,900,000 $ 25,600,000
2021 Credit Agreement        
Debt Instrument [Line Items]        
Proceeds from credit agreement $ 1,800,000      
Fixed interest rate, annual 5.45%      
Outstanding balance     $ 1,800,000 $ 0
Total capacity $ 2,700,000      
Series D Convertible Preferred Stock | 2020 Credit Agreement        
Debt Instrument [Line Items]        
Warrants issued (in shares)   750,000    
Period for repayment termination trigger   12 months