Net Loss Per Share Attributable to Common Stockholders - Computation of Potentially Dilutive Securities Outstanding Excluded from Computation of Diluted Shares (Detail)
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9 Months Ended | |
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Sep. 30, 2014
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Sep. 30, 2013
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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]
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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]
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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 |