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Income Taxes - Summary of Changes in Deferred Tax Valuation Allowance (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Deferred tax valuation allowance, Beginning Balance $ 1,534 $ 1,565 $ 2,200
Additions 1,256 150 17
Deductions (455) (134) (574)
Translation adjustments (142) (47) (78)
Deferred tax valuation allowance, Ending Balance $ 2,193 $ 1,534 $ 1,565