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Stockholders' Equity - Summary of Non-Vested Options (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified |
12 Months Ended |
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Dec. 31, 2014
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| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |
| Shares, Non-vested, Beginning balance | 276 |
| Shares, Granted | 280 |
| Shares, Vested | (137) |
| Shares, Forfeited | (7) |
| Shares, Non-vested, Ending balance | 412 |
| Weighted-average grant-date fair value, Non-vested, Beginning balance | $ 0.58 |
| Weighted-average grant-date fair value, Granted | $ 0.93 |
| Weighted-average grant-date fair value, Vested | $ 0.58 |
| Weighted-average grant-date fair value, Forfeited | $ 0.58 |
| Weighted-average grant-date fair value, Non-vested, Ending balance | $ 0.82 |