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Stockholders' Equity (Common Stock are Reserved for Future Issuance) (Detail) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Equity [Abstract] |  |
Warrants outstanding | 8,540 | 14,850
Stock options outstanding | 8,994 | 13,159
Options reserved for future issuance under the Company's 2007 Incentive Plan | 2,484 |
Shares reserved for future issuance under the Employee Stock Purchase Plan | 642 |
Total reserved for future issuance | 20,660 |

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