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Net Loss Per Share (Tables) | 9 Months Ended
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Sep. 30, 2014
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,
| 2014 |  | 2013
Warrants to purchase common stock | 8,540 |  |  | 18,903 |
Options to purchase common stock | 8,994 |  |  | 9,928 |
Total | 17,534 |  |  | 28,831 |

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