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Stock-Based Compensation and Other Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Stock-Based Compensation and Other Benefit Plans [Abstract] |
Summary of Stock-Based Compensation |
| Years Ended December 31,
| 2019 |  | 2018 |  | 2017
| (in thousands)
Stock-based compensation - equity awards | $ | 985 |  | $ | 820 |  | $ | 977
Stock-based compensation - liability awards |  | 2,521 |  |  | 1,568 |  |  | 121
Total stock-based compensation | $ | 3,506 |  | $ | 2,388 |  | $ | 1,098
Stock Option Valuation Assumptions |
| Years Ended December 31,
| 2019 |  | 2018 |  |  | 2017
Weighted average exercise price - ($/share) | $ | 2.08 |  | $ | 1.05 |  | $ | 0.99 |
Expected life in years |  | 3.2 |  |  | 3.5 |  |  | 3.2 |
Average expected volatility |  | 73 | % |  | 71 | % |  | 73 | %
Risk-free interest rate |  | 2.33 | % |  | 2.51 | % |  | 1.51 | %
Weighted average grant date fair value - ($/share) | $ | 1.06 |  | $ | 0.68 |  | $ | 0.49 |
Stock Option Activity |
|  | Number of Shares Underlying Options |  | Weighted Average Exercise Price Per Share |  |  | Weighted Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value
|  | (in thousands) |  |  |  |  |  | (in years) |  |  | (in thousands)
Outstanding at January 1, 2019 |  | 2,601 |  | $ | 1.54 |  |  |  |  |  |
Granted |  | 923 |  |  | 2.08 |  |  |  |  |  |
Exercised |  | (260) |  |  | 0.99 |  |  |  |  |  |
Unvested shares forfeited |  | (306) |  |  | 1.50 |  |  |  |  |  |
Vested shares expired |  | (124) |  |  | 6.70 |  |  |  |  |  |
Outstanding at December 31, 2019 |  | 2,834 |  |  | 1.55 |  |  | 2.77 |  | $ | 2,301
Exercisable at December 31, 2019 |  | 1,858 |  |  | 1.46 |  |  | 2.34 |  | $ | 1,736
Summary of Non Vested Awards |
|  | Restricted Stock |  | Weighted Average Grant Price
|  | (in thousands) |  |  |
Non-vested shares outstanding at January 1, 2019 |  | 507 |  | $ | 0.91
Awards granted |  | 309 |  |  | 2.00
Awards vested |  | (307) |  |  | 1.12
Awards forfeited |  | (166) |  |  | 1.29
Non-vested shares outstanding at December 31, 2019 |  | 343 |  |  | 1.52
SAR Activity |
|  | Number of Shares Underlying SARs |  | Weighted Average Exercise Price Per Share |  |  | Term |  | Aggregate Intrinsic Value
|  | (in thousands) |  |  |  |  |  | (in years) |  |  | (in thousands)
Outstanding at January 1, 2019 |  | 3,369 |  | $ | 0.96 |  |  |  |  |  |
Granted |  | 1,148 |  |  | 2.23 |  |  |  |  |  |
Exercised |  | (558) |  |  | 1.04 |  |  |  |  |  |
Unvested shares forfeited |  | (541) |  |  | 1.41 |  |  |  |  |  |
Vested shares expired |  | — |  |  | — |  |  |  |  |  |
Outstanding at December 31, 2019 |  | 3,418 |  |  | 1.30 |  |  | 3.21 |  | $ | 3,240
Exercisable at December 31, 2019 |  | 952 |  |  | 0.99 |  |  | 2.56 |  | $ | 1,173

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