Quarterly report pursuant to Section 13 or 15(d)

Accrued Liabilities - Additional Information (Detail)

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Accrued Liabilities - Additional Information (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Accrued liabilities $ 2,669 $ 893