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Basic and Diluted Net Loss Per Share - Additional Information (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Stock options [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Stock options outstanding excluded in calculation of diluted net loss per share 7,868,033 8,263,998 7,868,033 8,263,998