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Net Loss Per Share - Calculation of Historical Outstanding Dilutive Securities Not Included in Diluted Loss Per Share (Detail)
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Outstanding dilutive securities not included in diluted loss per share calculation 7,384,325 7,518,348
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 6,779,998 6,909,332
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 604,327 609,016