Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Schedule of Changes in Fair Value of Liabilities (Detail)

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Summary of Significant Accounting Policies - Schedule of Changes in Fair Value of Liabilities (Detail) - Level 3 [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance $ 1,220 $ 13,596
Issuance of financial instrument   258
Change in fair value (75) (11,121)
Settlement of financial instrument   (1,513)
Ending Balance $ 1,145 $ 1,220