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Net Loss Per Share - Calculation of Historical Outstanding Dilutive Securities Not Included in Diluted Loss Per Share (Detail) - shares
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Outstanding dilutive securities not included in diluted loss per share calculation 9,602,420 9,576,750
Outstanding options to purchase common stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Outstanding dilutive securities not included in diluted loss per share calculation 9,501,818 8,427,501
Warrants and pre-funded warrants to purchase common stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Outstanding dilutive securities not included in diluted loss per share calculation 100,602 1,149,249