Summary of Significant Accounting Policies - Additional Information (Detail) - Options [Member] - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Summary Of Accounting Policies [Line Items]
Shares excluded from computations of diluted income (loss) per share	1,545,512	282,276	627,778	201,091
Dilutive effect of common stock equivalent shares using treasury stock method	952,858