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Income (Loss) Per Share - Additional Information (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Common Stock Equivalents        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potentially dilutive securities excluded from computation of diluted earnings per common share 2,894,029 20,215,325 25,332,390 21,502,935