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Income Taxes - Summary of Reconciliation of Uncertain Tax Positions (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance $ 425 $ 306 $ 219
Addition for current year tax positions 100 74 58
Addition for prior year tax positions 2 45 29
Reduction for prior year positions resolved during the current year (41)    
Ending balance $ 486 $ 425 $ 306