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BORROWINGS - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2018
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2018
Debt Instrument [Line Items]              
Interest expense   $ 100,000 $ 100,000 $ 100,000 $ 100,000    
Secured Debt              
Debt Instrument [Line Items]              
Debt instrument, face amount $ 1,500,000            
Periodic monthly payment $ 50,000            
Interest only payments, period 6 months            
Debt issuance costs, gross             $ 26,000
Term loan, net of interest and debt issuance cost   100,000   100,000   $ 600,000  
Carrying value of term loan and vendor financing agreements   0   0   $ 0  
Secured Debt | Prime Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate 2.00%            
Line of Credit | Revolving Credit Facility | Revolving Line of Credit Due August 2018              
Debt Instrument [Line Items]              
Line of credit facility, maximum borrowing capacity   1,500,000   1,500,000      
Line of Credit | Revolving Credit Facility | Revolving Line of Credit Due November 2018              
Debt Instrument [Line Items]              
Line of credit facility, maximum borrowing capacity   2,000,000   $ 2,000,000      
Credit facility renewal term       3 years      
Line of Credit | Revolving Credit Facility | Prime Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate       1.00%      
Vendor Financing Arrangements              
Debt Instrument [Line Items]              
Term loan, net of interest and debt issuance cost   1,104,000   $ 1,104,000      
Carrying value of term loan and vendor financing agreements   $ 345,000   $ 345,000      
Interest rate, effective percentage   7.50%   7.50%