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Net Loss Per Share (Tables) | 12 Months Ended
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Dec. 31, 2013
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):
| December 31,
| 2013 |  | 2012
Warrants to purchase common stock | 14,850 |  |  | 13,216 |
Options to purchase common stock | 13,159 |  |  | 7,672 |
Total | 28,009 |  |  | 20,888 |

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