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Significant Accounting Policies - Computation Of Basic And Diluted Net Income (Loss) Per Share (Parenthetical) (Detail) - shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]      
Options to purchase shares of Common Stock not included in the computation of diluted income (loss) per share 238,792 1,895,675 1,989,248