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Stock-Based Compensation and Other Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Stock-Based Compensation and Other Benefit Plans [Abstract] |
Summary of Stock-Based Compensation |
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
| (in thousands)
Stock-based compensation - equity awards | $ | 848 |  | $ | 985 |  | $ | 820
Stock-based compensation - liability awards |  | (734) |  |  | 2,521 |  |  | 1,568
Total stock-based compensation | $ | 114 |  | $ | 3,506 |  | $ | 2,388
Stock Option Valuation Assumptions |
| Year Ended December 31, |
| 2020 |  | 2019 |  | 2018 |
Weighted average exercise price - ($/share) | $ | 1.23 |  | $ | 2.08 |  | $ | 1.05 |
Expected life in years |  | 6.0 |  |  | 3.2 |  |  | 3.5 |
Average expected volatility |  | 74 | % |  | 73 | % |  | 71 | %
Risk-free interest rate |  | 0.42 | % |  | 2.33 | % |  | 2.51 | %
Weighted average grant date fair value - ($/share) | $ | 0.79 |  | $ | 1.06 |  | $ | 0.68 |
Stock Option Activity | Performance stock option activity for the year ended December 31, 2020 is provided below:
|  | 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, 2020 |  | — |  | $ | — |  |  |  |  |  |
Granted |  | 644 |  |  | 1.23 |  |  |  |  |  |
Exercised |  | — |  |  | — |  |  |  |  |  |
Unvested shares forfeited |  | — |  |  | — |  |  |  |  |  |
Vested shares expired |  | — |  |  | — |  |  |  |  |  |
Outstanding at December 31, 2020 |  | 644 |  |  | 1.23 |  |  | 9.49 |  | $ | 348
Exercisable at December 31, 2020 |  | — |  | $ | — |  |  | — |  | $ | —
Stock option activity that do not contain a market or performance condition for the year ended December 31, 2020 is provided below:
|  | 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, 2020 |  | 2,834 |  | $ | 1.55 |  |  |  |  |  |
Granted |  | — |  |  | — |  |  |  |  |  |
Exercised |  | (65) |  |  | 0.96 |  |  |  |  |  |
Unvested shares forfeited |  | (60) |  |  | 1.83 |  |  |  |  |  |
Vested shares expired |  | (904) |  |  | 1.89 |  |  |  |  |  |
Outstanding at December 31, 2020 |  | 1,804 |  |  | 1.38 |  |  | 1.94 |  | $ | 968
Exercisable at December 31, 2020 |  | 1,364 |  | $ | 1.20 |  |  | 1.63 |  | $ | 861
Summary of Non Vested Awards |
|  | Restricted Stock |  | Weighted Average Grant Date Fair Value
|  | (in thousands) |  |  |
Non-vested shares outstanding at January 1, 2020 |  | 343 |  | $ | 1.52
Awards granted |  | 971 |  |  | 1.23
Awards vested |  | (159) |  |  | (1.35)
Awards forfeited |  | — |  |  | —
Non-vested shares outstanding at December 31, 2020 |  | 1,155 |  | $ | 1.30
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, 2020 |  | 3,418 |  | $ | 1.30 |  |  |  |  |  |
Granted |  | — |  |  | — |  |  |  |  |  |
Exercised |  | (357) |  |  | 0.95 |  |  |  |  |  |
Unvested SARs forfeited |  | (60) |  |  | 1.83 |  |  |  |  |  |
Vested SARs expired |  | (61) |  |  | 1.34 |  |  |  |  |  |
Outstanding at December 31, 2020 |  | 2,940 |  |  | 1.33 |  |  | 2.22 |  | $ | 1,688
Exercisable at December 31, 2020 |  | 1,758 |  | $ | 1.19 |  |  | 1.91 |  | $ | 1,144

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