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Net Income (Loss) Per Share of Common Stock - Additional Information (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Antidilutive shares excluded from computation of earnings per share 136,113 0 1,273,610 39,856