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Net Income (Loss) Per Share (Tables) | 6 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |
Common Shares Excluded from Net Income (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 Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Warrants to purchase common stock | 19,557 |  |  | 1,076 |  |  | 19,557 |  |  | 1,871 |
Options to purchase common stock | 505 |  |  | 322 |  |  | 505 |  |  | 515 |
Total | 20,062 |  |  | 1,398 |  |  | 20,062 |  |  | 2,386 |

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