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Fair Value Measurements - Summary of Reconciliation of Beginning and Ending Balances for Liabilities Measured at Fair Value on Recurring Basis (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance $ 0
Issuance of warrants 4,695
Loss adjustment to fair value 1,906
Ending balance $ 6,601