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Income Taxes - Summary of Changes In Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]    
Unrecognized tax benefit, beginning of year $ 687 $ 811
Increase (decrease) related to current year positions (125) (124)
Settlements 0 0
Unrecognized tax benefit, end of year $ 562 $ 687