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Income Taxes - Schedule of Change in Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]    
Balance at beginning of year $ 723 $ 555
Additions based on tax positions related to the current year 261 255
Additions for tax positions of prior years 44  
Reductions for tax positions of prior years   (87)
Balance at end of year $ 1,028 $ 723