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Debt - Summary of Outstanding Borrowings (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Apr. 17, 2015
Debt Instrument [Line Items]      
Total debt $ 4,606 $ 5,330  
Short-term portion (4,606) (5,330)  
Total long-term debt, net 0 0  
Line of credit | 2013 Loan and Security Agreement      
Debt Instrument [Line Items]      
Total debt 2,645 3,278  
Loans payable | Credit agreement      
Debt Instrument [Line Items]      
Total debt 4,474 5,000  
Discount on Term Loan (2,374) (2,785) $ (2,700)
Unamortized debt issuance costs related to Term Loan $ 139 $ 163