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Debt - Credit Facility (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended
Aug. 05, 2019
Aug. 31, 2019
Mar. 31, 2020
Dec. 31, 2019
Jul. 31, 2019
Debt          
Outstanding balance     $ 2,000    
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  
2019 Credit Facility | Prime Rate          
Debt          
Effective interest rate     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%    
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 | Prime Rate | Minimum          
Debt          
Interest rate, basis spread percentage   6.75%      
Effective interest rate     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%    
Prepayment fee (as a percentage)   2.00%      
Debt amount   $ 6,000      
Number of months of interest only payment   12 months      
Number of months of equal principal payments plus accrued interest   30 months      
2019 Credit Facility - Term Loan | Prime Rate          
Debt          
Interest rate, negative basis spread percentage   0.75%      
Effective interest rate   4.75%