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Stock and Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Unvested Restricted Stock Units | The following table summarizes the activity for unvested restricted stock units for the years ended December 31, 2017 and 2016:
| Units |  |  | Weighted Average Fair Value Per RSU |
Unvested restricted stock units at December 31, 2015 |  | 315,847 |  |  | $ | 3.99 |
Awarded |  | 31,327 |  |  | $ | 2.81 |
Vested |  | (105,443) |  |  | $ | 4.66 |
Forfeited |  | (23,319) |  |  | $ | 5.12 |
Unvested restricted stock units at December 31, 2016 |  | 218,412 |  |  | $ | 4.28 |
Awarded |  | 56,759 |  |  | $ | 1.48 |
Vested |  | (112,340) |  |  | $ | 3.99 |
Forfeited |  | (2,289) |  |  | $ | 4.41 |
Unvested restricted stock units at December 31, 2017 |  | 165,120 |  |  | $ | 3.40 |

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- Definition Tabular disclosure of the change in restricted stock units (RSUs). + References No definition available. + Details
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