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Stock-Based Compensation and Other Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2019
Stock-Based Compensation and Other Benefit Plans [Abstract] |
Summary of Stock-Based Compensation |
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
|  | (in thousands)
Stock-based compensation - equity awards |  | $ | 595 |  | $ | 397 |  | $ | 622 |  | $ | 547
Stock-based compensation - liability awards |  |  | (698) |  |  | 2,044 |  |  | 998 |  |  | 2,209
Total stock-based compensation |  | $ | (103) |  | $ | 2,441 |  | $ | 1,620 |  | $ | 2,756
Stock Option Valuation Assumptions |
| Six Months Ended June 30,
| 2019 |  | 2018 |
Weighted average exercise price - ($/share) | $ | 2.08 |  | $ | 1.05 |
Expected life in years |  | 3.2 |  |  | 3.5 |
Average expected volatility |  | 72.53 | % |  | 70.50 | %
Risk-free interest rate |  | 2.33 | % |  | 2.51 | %
Weighted average grant date fair value - ($/share) | $ | 1.06 |  | $ | 0.68 |
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 |  | (114) |  |  | 0.93 |  |  |  |  |  |
Unvested shares forfeited |  | (286) |  |  | 1.44 |  |  |  |  |  |
Vested shares expired |  | (76) |  |  | 6.98 |  |  |  |  |  |
Outstanding at June 30, 2019 |  | 3,048 |  |  | 1.60 |  |  | 3.15 |  | $ | 1,249
Exercisable at June 30, 2019 |  | 2,026 |  |  | 1.55 |  |  | 2.67 |  | $ | 901
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 |  | (232) |  |  | 1.14
Awards forfeited |  | (166) |  |  | 1.29
Non-vested shares outstanding at June 30, 2019 |  | 418 |  |  | 1.44
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 |  | (270) |  |  | 0.86 |  |  |  |  |
Unvested shares forfeited |  | (521) |  |  | 1.38 |  |  |  |  |
Vested shares expired |  | — |  |  | — |  |  |  |  |
Outstanding at June 30, 2019 |  | 3,726 |  |  | 1.29 |  | 3.65 |  | $ | 1,916
Exercisable at June 30, 2019 |  | 1,240 |  |  | 1.04 |  | 3.01 |  | $ | 785

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