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Debt - 2014 Loan and Security Agreement (Details)
1 Months Ended 12 Months Ended
Feb. 28, 2014
USD ($)
lender
$ / shares
shares
Dec. 31, 2016
USD ($)
lender
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]        
Number of lenders | lender   2    
Payments of debt issuance costs   $ 206,000 $ 0 $ 0
Total debt, net carrying value   33,654,000 37,039,000  
Debt, gross   $ 33,714,000    
Term Loan | 2014 Loan and Security Agreement        
Debt Instrument [Line Items]        
Credit facility, maximum borrowing capacity $ 30,000,000.0      
Number of lenders | lender 2      
Credit facility, remaining borrowing capacity $ 10,000,000.0      
Credit facility, minimum incremental borrowing amount $ 1,000,000.0      
Total debt, net carrying value     $ 20,000,000  
Term Loan | 2014 Loan and Security Agreement | Prime Rate        
Debt Instrument [Line Items]        
Term loan, minimum interest rate 10.00%      
Term Loan | 2014 Loan and Security Agreement | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Debt instrument, basis spread (as a percentage) 9.00%      
Term Loan | Tranche One        
Debt Instrument [Line Items]        
Credit facility, maximum borrowing capacity $ 20,000,000.0      
Payments of debt issuance costs 400,000      
Debt, gross $ 20,000,000.0      
Common Stock | Term Loan | 2014 Loan and Security Agreement        
Debt Instrument [Line Items]        
Warrants issued | shares 177,865      
Exercise price (in dollars per share) | $ / shares $ 10.12      
Common Stock | Term Loan | Tranche One        
Debt Instrument [Line Items]        
Warrants vested, shares | shares 118,577      
Warrants vested, fair value $ 1,000,000      
Common Stock Warrant | Term Loan | 2014 Loan and Security Agreement        
Debt Instrument [Line Items]        
Class of warrant or right, vesting period (in years) 10 years      
Warrants unvested, shares | shares 59,288