Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Aggregate Future Principal and Final Fee Payments of Interest Bearing Obligations (Details)

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Long-Term Debt - Aggregate Future Principal and Final Fee Payments of Interest Bearing Obligations (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Aggregate future principal and final fee payments of total interest bearing obligations - long-term [Abstract]    
Three months ending December 31, 2016 $ 2,252  
Year ended 2017 14,809  
Year ended 2018 18,085  
Year ended 2020 15,748  
Long-term debt including current portion, interest, final payment fee, discount and issuance cost 50,894  
Less: interest, final payment fee, discount and issuance cost (5,675)  
Long-term debt including current portion 45,219 $ 48,667
Less: interest bearing obligations – current (12,461) (5,910) [1]
Interest bearing obligations – non-current $ 32,758 $ 42,757 [1]
[1] The condensed consolidated balance sheet as of December 31, 2015 has been derived from the audited consolidated financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015.