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Net Income (Loss) per Share - Computation Of Basic And Diluted Net Income (Loss) Per Share (Parenthetical) (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share [Abstract]        
Options to purchase shares of Common Stock not included in the computation of diluted income (loss) per share 449,464 533,689 1,845,289 141,971