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Net Income (Loss) Per Share - Additional Information (Detail) (Stock Options [Member])
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Stock Options [Member]
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Outstanding stock options and warrants 154,000 50,000 144,000