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Long-Term Debt - Schedule of Long Term Debt and Unamortized Debt Discount (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Notes payable, gross $ 42,000 $ 32,000
Less: Unamortized debt discount and issuance costs (496) (325)
Accretion of final payment fee 401 102
Carrying value of notes payable 41,905 31,777
Less: Current portion of long-term debt (3,778) 0
Long-term debt, net $ 38,127 $ 31,777