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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2014
Equity [Abstract] |
Summary of Common Shares Reserved for Future Issuance | The Company has reserved shares of common stock for possible future issuance as of December 31, 2014 and 2013 as follows (in thousands):
| Shares
| 2014 |  | 2013
Common stock warrants outstanding | 4,118 |  |  | — |
Stock options outstanding under the 2009 Omnibus Incentive Compensation Plan and previous plans | 3,065 |  |  | 3,933 |
Restricted stock units outstanding | 1,629 |  |  | 1,108 |
Future grants of awards under the 2009 Omnibus Incentive Compensation Plan | 4,463 |  |  | 3,668 |
Shares available under the Employee Stock Purchase Plan | 1,385 |  |  | 1,500 |
Total shares of common stock reserved for issuance | 14,660 |  |  | 10,209 |

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