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Debt - Term Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Notes payable, principal $ 9,505  
Loan And Security Agreement | Term Loan 1    
Debt Instrument [Line Items]    
Notes payable, principal 9,505 $ 5,000
Add: accretion of final payment fee 171 16
Less: unamortized debt discount (201) (237)
Long-term debt 9,475 4,779
Less: current portion of notes payable, net (9,475) (153)
Long-term debt, excluding current maturities $ 0 $ 4,626