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Debt - Summary of Interest Expense Components (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 17, 2015
Mar. 31, 2016
Mar. 31, 2015
Debt Instrument [Line Items]      
Amortization of deferred financing costs   $ 61 $ 83
Accretion of debt discount associated with Warrant   306  
Accretion of discount associated with additional warrant feature   105  
Mark to market of the additional warrant feature   59  
Total   789  
Loans payable | Credit agreement      
Debt Instrument [Line Items]      
Interest expense   180  
Accretion of termination fees (over term of Term Loan at rate of 8%)   $ 46  
Exit fee as a percent of aggregate principal 8.00% 8.00%  
Loans payable | Credit agreement | LIBOR      
Debt Instrument [Line Items]      
Spread on variable rate (as percent) 14.00% 14.00%  
Line of credit | 2013 Loan and Security Agreement      
Debt Instrument [Line Items]      
Interest expense   $ 32