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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Options to purchase shares of Common Stock not included in the computation of diluted income (loss) per share 44,793 1,510,728 79,857 1,510,728