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Summary of Significant Accounting Policies - Schedule of Reconciliation of Liabilities Measured at Fair Value (Detail) $ in Thousands | 12 Months Ended
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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

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