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Stockholders' Equity (Deficit) (Tables) | 12 Months Ended
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Dec. 31, 2014
Stockholders Equity Note [Abstract] |
Summary of Number of Shares of Common Stock Reserved | The Company has reserved the following number of shares of common stock at December 31, 2014 and 2013:
|  | As of December 31, |
|  | 2014 |  |  | 2013 |
Redeemable convertible preferred stock |  |  | — |  |  |  | 6,954,691 |
Warrants to purchase common stock |  |  | 128,663 |  |  |  | — |
Common stock options |  |  | 3,561,104 |  |  |  | 1,201,770 |
Total |  |  | 3,689,767 |  |  |  | 8,156,461 |

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