Net Loss per Share Attributable to Common Stockholders - Summary of Common Stock Equivalents Excluded from Computation of Diluted Net Income (Loss) Per Share (Detail)
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3 Months Ended | |
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Mar. 31, 2015
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Mar. 31, 2014
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Stock options | ||
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Common stock equivalents excluded from computation of diluted net income (loss) per share | 2,331,401 | 1,239,817 |
Common stock warrants | ||
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Common stock equivalents excluded from computation of diluted net income (loss) per share | 198,662 | 173,975 |
Shares expected to be purchased on June 30 under the 2014 ESPP | ||
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Common stock equivalents excluded from computation of diluted net income (loss) per share | 8,532 | 22,114 |