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Long-Term Debt (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended
Feb. 07, 2018
Feb. 28, 2017
Aug. 31, 2015
Dec. 31, 2018
Credit Facility        
Outstanding credit facility amount   $ 16,500    
Prepayment fee   5.50%    
Debt issuance costs     $ 100  
Expected future principal payments        
2019       $ 0
2020       10,208
2021       12,250
2022       2,042
Total expected future principal payments       $ 24,500
Series F convertible preferred stock (in shares)        
Credit Facility        
Aggregate number of shares called by warrants (in shares) 233,577 29,197    
Period of warrants 10 years 10 years    
Exercise price (in dollars per share) $ 1.37 $ 1.37    
Term A loan facility        
Credit Facility        
Maximum borrowing amount under credit facility     15,500  
Fixed interest rate on credit facility   7.95%    
Additional borrowing amount under credit facility   $ 1,000    
Net proceeds from credit facility   $ 500    
Term A loan facility | On or after February 24, 2018 but prior to February 24, 2019/On or after February 7, 2019 but prior to February 7, 2020        
Credit Facility        
Prepayment fee   1.50%    
Term A loan facility | On or after February 24, 2019/On or after February 7, 2020        
Credit Facility        
Prepayment fee   1.00%    
Term A loan facility | LIBOR        
Credit Facility        
Variable interest rate on credit facility   6.90%    
Original credit facility        
Credit Facility        
Outstanding credit facility amount     $ 12,000  
Term B loan facility        
Credit Facility        
Outstanding credit facility amount $ 24,500 $ 9,000    
Fixed interest rate on credit facility 7.95%   7.95%  
Additional borrowing amount under credit facility $ 8,000      
Net proceeds from credit facility $ 8,000      
Trailing period revenue 12 months      
Minimum amount of revenue for interest only period $ 25,000      
Final payment fee   5.00%    
Increase in interest rate in default       5.00%
Term B loan facility | On or after February 24, 2018 but prior to February 24, 2019/On or after February 7, 2019 but prior to February 7, 2020        
Credit Facility        
Prepayment fee   1.50%    
Term B loan facility | On or after February 24, 2019/On or after February 7, 2020        
Credit Facility        
Prepayment fee   1.00%    
Term B loan facility | Prior to February 24, 2018/Prior to February 7, 2019        
Credit Facility        
Prepayment fee   2.50%    
Term B loan facility | LIBOR        
Credit Facility        
Variable interest rate on credit facility 6.90%      
Term B loan facility | Minimum        
Credit Facility        
Outstanding credit facility amount     $ 3,500  
Term B loan facility | Maximum        
Credit Facility        
Outstanding credit facility amount     $ 10,000