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Net Loss Per Share Attributable to Common Stockholders - Computation of Potentially Dilutive Securities Outstanding Excluded from Computation of Diluted Shares (Detail)
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities excluded from computation of diluted shares outstanding 17,769,875 17,797,596
Series A, Series B, and Series C, Convertible Preferred Stock [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities excluded from computation of diluted shares outstanding 15,208,048 15,208,048
Options to purchase common stock [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities excluded from computation of diluted shares outstanding 2,561,827 2,589,548