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Income Taxes - Schedule of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Balance at beginning of year $ 805  
Additions based on tax positions related to in prior years 707 $ 690
Additions based on tax positions related to current year 619 115
Balance at end of year $ 2,131 $ 805