Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

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Income Taxes - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Tax Disclosure [Abstract]        
Liability for unrecognized tax benefit, including related estimates of penalties and interest $ 0 $ 0 $ 0 $ 0
Income tax provision (benefit) $ 44,000 $ 28,000 $ 127,000 $ 81,000
Projected annual effective tax rate (0.80%) (0.80%) (0.70%) (0.60%)
Statutory tax rate 34.00% 34.00% 34.00% 34.00%