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Accounts Payable and Accrued Liabilities - Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Payables And Accruals [Abstract]    
Accounts payable $ 2,054 $ 4,187
Accrued compensation 844 394
Accrued expenses 3,774 1,500
Accounts payable and accrued liabilities $ 6,672 $ 6,081