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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
Jun. 30, 2018
Credit Facility        
Outstanding credit facility amount   $ 16,500    
Debt issuance costs     $ 72  
Expected future principal payments        
2019       $ 6,805
2020       8,167
2021       8,167
2022       1,361
Long-term Debt, Total       $ 24,500
Term A loan facility        
Credit Facility        
Maximum borrowing amount under credit facility     15,500  
Fixed interest rate on credit facility (as a percent)   7.95%    
Variable interest rate on credit facility (as a percent)   6.90%    
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 (in percentage)   1.50%    
Term A loan facility | On or after February 24, 2019/On or after February 7, 2020        
Credit Facility        
Prepayment fee (in percentage)   1.00%    
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 (as a percent) 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 (in percentage)   5.00%    
Increase in interest rate in default (in percentage)       5.00%
Term B loan facility | LIBOR        
Credit Facility        
Variable interest rate on credit facility (as a percent) 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  
Term B loan facility | Prior to February 24, 2018/Prior to February 7, 2019        
Credit Facility        
Prepayment fee (in percentage)   2.50%    
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 (in percentage)   1.50%    
Term B loan facility | On or after February 24, 2019/On or after February 7, 2020        
Credit Facility        
Prepayment fee (in percentage)   1.00%    
Series F convertible preferred stock        
Credit Facility        
Aggregate number of shares called by warrants 233,577 29,197    
Period of warrants (in years) 10 years 10 years    
Exercise Price $ 1.37 $ 1.37   $ 1.37