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Debt - Credit Facility (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 05, 2019
Jul. 31, 2020
Aug. 31, 2019
Jun. 30, 2020
Jun. 30, 2020
Jul. 15, 2020
Dec. 31, 2019
Jul. 31, 2019
Debt                
Common stock, par value       $ 0.0001 $ 0.0001   $ 0.0001  
Outstanding balance       $ 2,000 $ 2,000      
Subsequent Events                
Debt                
Common stock, par value           $ 0.01    
2017 Credit Facility                
Debt                
Repayment of credit facility     $ 800          
Principal amount               $ 8,000
2019 Credit Facility                
Debt                
Number of shares the warrant can be converted to 9,375              
Warrant exercise price $ 8.91              
Amount bank could receive if takes the option to put the warrants upon expiration or a liquidity event $ 50              
Principal amount       8,420 8,420   $ 8,420  
2019 Credit Facility | Other (expense) income                
Debt                
Change in fair value of warrants       $ 12 $ 7      
2019 Credit Facility | Subsequent Events                
Debt                
Number of shares the warrant can be converted to           21,500    
2019 Credit Facility | Prime Rate                
Debt                
Effective interest rate       4.75% 4.75%      
2019 Credit Facility - Revolving Line Of Credit                
Debt                
Loan agreement amount     $ 5,000          
Agreement term     2 years          
Interest rate, basis spread percentage     1.50%          
Effective interest rate       10.57% 10.57%      
Commitment fee (as a percentage)     1.60%          
Termination fee (as a percentage)     1.00%          
Unused facility fee (as a percentage)     0.125%          
Debt amount     $ 2,000          
Remaining availability     $ 3,000          
2019 Credit Facility - Revolving Line Of Credit | Subsequent Events                
Debt                
Reduction of interest rate floor   2.00%            
2019 Credit Facility - Revolving Line Of Credit | Prime Rate | Subsequent Events                
Debt                
Interest rate, basis spread percentage   1.50%            
Effective interest rate   4.75%            
2019 Credit Facility - Revolving Line Of Credit | Prime Rate | Minimum                
Debt                
Interest rate, basis spread percentage     6.75%          
Effective interest rate       6.75% 6.75%      
2019 Credit Facility - Term Loan                
Debt                
End-of-term fee (as a percent)     7.00%          
Agreement term     42 months          
Effective interest rate       8.66% 8.66%      
Prepayment fee (as a percentage)     2.00%          
Debt amount     $ 6,000          
Number of months of interest only payment     12 months   12 months      
Number of months of equal principal payments plus accrued interest     30 months          
2019 Credit Facility - Term Loan | Subsequent Events                
Debt                
Number of months of interest only payment   16 months            
Reduction of interest rate floor   1.00%            
2019 Credit Facility - Term Loan | Prime Rate                
Debt                
Interest rate, negative basis spread percentage     0.75%          
Effective interest rate     4.75%          
2019 Credit Facility - Term Loan | Prime Rate | Subsequent Events                
Debt                
Interest rate, negative basis spread percentage   0.75%            
Effective interest rate   3.75%