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Debt - Credit Facility (Details)
1 Months Ended 9 Months Ended
Aug. 05, 2019
USD ($)
$ / shares
shares
Jul. 06, 2018
USD ($)
payment
$ / shares
shares
May 04, 2017
USD ($)
payment
Aug. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jul. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt              
Outstanding balance         $ 2,000,000    
2017 Credit Facility              
Debt              
Loan agreement amount     $ 12,000,000        
Reimbursement of principal payments         $ 1,000,000    
End-of-term fee (as a percent)   7.00% 6.00%        
Number of shares the warrant can be converted to | shares   9,375          
Warrant exercise price | $ / shares   $ 8.91          
Warrant exercise expiration period   5 years          
Fair value of warrants   $ 43,000          
Increase in rate in the event of default (as a percentage)         5.00%    
Repayment of credit facility       $ 800,000      
Principal amount         $ 8,420,000 $ 8,000,000 $ 12,840,000
2017 Credit Facility | Prepayment period - first 12 months              
Debt              
Prepayment fee         240,000    
2017 Credit Facility | Prepayment period - months 13-24              
Debt              
Prepayment fee         $ 120,000    
2017 Credit Facility | Minimum              
Debt              
Number of interest and principal payments | payment   24 24        
2017 Credit Facility | Maximum              
Debt              
Number of interest and principal payments | payment   36          
2017 Credit Facility | Prime Rate              
Debt              
Interest rate, negative basis spread percentage   0.75% 0.75%        
Effective interest rate         4.75%    
SVB Credit Facility              
Debt              
Number of shares the warrant can be converted to that was cancelled | shares   9,229          
Warrant exercise price | $ / shares   $ 26.00          
2019 Credit Facility              
Debt              
Number of shares the warrant can be converted to | shares 9,375            
Warrant exercise price | $ / shares $ 8.91            
Amount bank could receive if takes the option to put the warrants upon expiration or a liquidity event $ 50,000            
2019 Credit Facility - Revolving Line Of Credit              
Debt              
Loan agreement amount       $ 5,000,000      
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       $ 2,000,000      
Remaining availability       $ 3,000,000      
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       $ 6,000,000      
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%