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Debt - Credit Facility (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 22, 2021
Jun. 30, 2020
Aug. 05, 2019
Jul. 31, 2021
Jul. 31, 2020
Aug. 31, 2019
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Jul. 20, 2020
Debt                      
Exercise of warrants (in shares) 21,463                    
Other income (expense)             $ 1,000 $ (12,000) $ (13,000) $ (27,000)  
2019 Credit Facility                      
Debt                      
Number of shares the warrant can be converted to     9,375               21,500
Warrant exercise price     $ 8.91               $ 0.01
Amount bank could receive if takes the option to put the warrants upon expiration or a liquidity event     $ 50,000                
Fair value of warrants                     $ 152,000
Other income (expense)             $ 11,000 $ (1,000) $ 21,000 $ (5,000)  
2019 Credit Facility | Prime Rate [Member]                      
Debt                      
Effective interest rate             4.00%   4.00%    
2019 Credit Facility - Revolving Line Of Credit                      
Debt                      
Loan agreement amount       $ 5,000,000.0              
Effective interest rate   6.75%     4.75%   10.18%   10.18%    
Commitment fee (as a percentage)           1.60%          
Termination fee (as a percentage)         1.00%            
Unused facility fee (as a percentage)         0.125%            
Remaining availability             $ 4,000,000.0   $ 4,000,000.0    
Outstanding balance             $ 1,000,000.0   $ 1,000,000.0    
2019 Credit Facility - Revolving Line Of Credit | Prime Rate [Member]                      
Debt                      
Interest rate, basis spread percentage       1.50%              
Effective interest rate             6.25%   6.25%    
2019 Credit Facility - Revolving Line Of Credit | Prime Rate [Member] | Minimum [Member]                      
Debt                      
Interest rate, basis spread percentage       4.75%              
2019 Credit Facility - Term Loan                      
Debt                      
End-of-term fee (as a percent)         7.00%            
Agreement term         46 months            
Effective interest rate   4.75%     3.75%   7.85%   7.85%    
Prepayment fee (as a percentage)         2.00%            
Debt amount         $ 6,000,000.0            
Number of months of interest only payment   12 months     16 months            
Number of months of equal principal payments         30 months            
Amount of principal payments         $ 200,000            
Outstanding balance             $ 2,800,000   $ 2,800,000    
2019 Credit Facility - Term Loan | Prime Rate [Member]                      
Debt                      
Interest rate, negative basis spread percentage         0.75%            
Effective interest rate         3.75%