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Stock-Based Compensation and Other Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2020
Stock-Based Compensation and Other Benefit Plans [Abstract] |
Summary of Stock-Based Compensation |
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2020 |  | 2019 |  | 2020 |  | 2019
|  | (in thousands)
Stock-based compensation - equity awards |  | $ | 60 |  | $ | 595 |  | $ | 205 |  | $ | 622
Stock-based compensation - liability awards |  |  | 660 |  |  | (698) |  |  | (2,054) |  |  | 998
Total stock-based compensation |  | $ | 720 |  | $ | (103) |  | $ | (1,849) |  | $ | 1,620
Stock Option Valuation Assumptions |
| Six Months Ended June 30, |
| 2020 |  | 2019 |
Weighted average exercise price - ($/share) | $ | 1.23 |  | $ | 2.08 |
Expected life in years |  | 6.00 |  |  | 3.2 |
Average expected volatility |  | 74.16 | % |  | 72.53 | %
Risk-free interest rate |  | 0.42 | % |  | 2.33 | %
Weighted average grant date fair value - ($/share) | $ | 0.79 |  | $ | 1.06 |
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, 2020 |  | 2,834 |  | $ | 1.55 |  |  |  |  |  |
Granted |  | 644 |  |  | 1.23 |  |  |  |  |  |
Exercised |  | — |  |  | — |  |  |  |  |  |
Unvested shares forfeited |  | (60) |  |  | 1.83 |  |  |  |  |  |
Vested shares expired |  | (132) |  |  | 4.71 |  |  |  |  |  |
Outstanding at June 30, 2020 |  | 3,286 |  |  | 1.35 |  |  | 3.40 |  | $ | 403
Exercisable at June 30, 2020 |  | 2,175 |  |  | 1.27 |  |  | 1.46 |  | $ | 345
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 |  | (145) |  |  | 1.39
Awards forfeited |  | — |  |  | —
Non-vested shares outstanding at June 30, 2020 |  | 1,169 |  |  | 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 |  | — |  |  | — |  |  |  |  |  |
Unvested shares forfeited |  | (60) |  |  | 1.83 |  |  |  |  |  |
Vested shares expired |  | — |  |  | — |  |  |  |  |  |
Outstanding at June 30, 2020 |  | 3,358 |  |  | 1.29 |  |  | 2.65 |  | $ | 709
Exercisable at June 30, 2020 |  | 2,177 |  |  | 1.16 |  |  | 2.36 |  | $ | 485

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