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Summary of Significant Accounting Policies - Schedule of Reconciliation of Liabilities Measured at Fair Value (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Change in fair value of warrant liability $ 17,507
Significant Unobservable Inputs (Level 3) [Member]  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Issuance of warrants, 30,704
Change in fair value of warrant liability (17,507)
Ending balance $ 13,197