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Income Taxes - Additional information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Tax Disclosure [Abstract]        
Provision (benefit) from income taxes $ 28 $ 0 $ (38) $ 0