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Indebtedness (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 01, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Debt Instrument [Line Items]            
Amount of debt accrued   $ 0   $ 0   $ 4,134
Debt issuance cost and discount       221 $ 0  
Loss on extinguishment of debt   $ 0 $ 0 915 $ 0  
Silicon Valley Bank | Term Loan            
Debt Instrument [Line Items]            
Principal and interest amount outstanding $ 13,800          
Prepayment penalty $ 200          
Percentage of final payment 6.00%          
Amount of final payment $ 900          
Amount of debt accrued 400          
Debt issuance cost and discount $ 200          
Loss on extinguishment of debt       $ 900