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Net Loss Per Share (Tables) | 9 Months Ended
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Sep. 30, 2015
Earnings Per Share [Abstract] |
Common Shares Excluded from Net Loss | The following table sets forth the potentially dilutive common shares excluded from the calculation of net loss per common share because their inclusion would be anti-dilutive (in thousands):
| Three and Nine Months Ended September 30,
| 2015 |  | 2014
Warrants to purchase common stock | 22,308 |  |  | 8,540 |
Options to purchase common stock | 11,188 |  |  | 8,994 |
Total | 33,496 |  |  | 17,534 |

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