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Stock-Based Compensation and Other Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2021
Stock-Based Compensation and Other Benefit Plans [Abstract] |
Summary of Stock-Based Compensation |
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
|  | (in thousands)
Stock-based compensation - equity awards |  | $ | 327 |  | $ | 322 |  | $ | 767 |  | $ | 527
Stock-based compensation - liability awards |  |  | (302) |  |  | (570) |  |  | 1,331 |  |  | (2,624)
Total stock-based compensation |  | $ | 25 |  | $ | (248) |  | $ | 2,098 |  | $ | (2,097)
Stock Option Valuation Assumptions |
| Nine Months Ended September 30,
| 2021 |  | 2020 |
Weighted average exercise price - ($/share) | $ | 3.14 |  | $ | 1.23 |
Expected life in years |  | 6.0 |  |  | 6.0 |
Average expected volatility |  | 75 | % |  | 74 | %
Risk-free interest rate |  | 0.95 | % |  | 0.42 | %
Weighted average grant date fair value - ($/share) | $ | 2.07 |  | $ | 0.79 |
Stock Option Activity | Stock option activity associated with the Monte Carlo model for the nine months ended September 30, 2021 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, 2021 |  | 644 |  | $ | 1.23 |  |  |  |  |  |
Granted |  | 402 |  |  | 3.14 |  |  |  |  |  |
Exercised |  | — |  |  | — |  |  |  |  |  |
Unvested shares forfeited |  | (687) |  |  | 1.96 |  |  |  |  |  |
Vested shares expired |  | — |  |  | — |  |  |  |  |  |
Outstanding at September 30, 2021 |  | 359 |  | $ | 1.96 |  |  | 9.00 |  | $ | 378
Exercisable at September 30, 2021 |  | 74 |  | $ | 1.23 |  |  | 8.74 |  | $ | 126
Stock option activity associated with the Black-Scholes model for the nine months ended September 30, 2021 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, 2021 |  | 1,804 |  | $ | 1.38 |  |  |  |  |  |
Granted |  | — |  |  | — |  |  |  |  |  |
Exercised |  | (1,088) |  |  | 1.20 |  |  |  |  |  |
Unvested shares forfeited |  | (64) |  |  | 2.33 |  |  |  |  |  |
Vested shares expired |  | — |  |  | — |  |  |  |  |  |
Outstanding at September 30, 2021 |  | 652 |  | $ | 1.60 |  |  | 1.73 |  | $ | 876
Exercisable at September 30, 2021 |  | 555 |  | $ | 1.47 |  |  | 1.61 |  | $ | 816
Summary of Non Vested Awards |
|  | Restricted Stock |  | Weighted Average Grant Date Fair Value
|  | (in thousands) |  |  |
Non-vested shares outstanding at January 1, 2021 |  | 1,155 |  | $ | 1.30
Awards granted |  | 605 |  |  | 3.13
Awards vested |  | (543) |  |  | 1.28
Awards forfeited |  | (462) |  |  | 2.00
Non-vested shares outstanding at September 30, 2021 |  | 755 |  | $ | 2.36
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, 2021 |  | 2,940 |  | $ | 1.33 |  |  |  |  |  |
Granted |  | — |  |  | — |  |  |  |  |  |
Exercised |  | (2,306) |  |  | 1.16 |  |  |  |  |  |
Unvested SARs forfeited |  | (125) |  |  | 2.33 |  |  |  |  |  |
Vested SARs expired |  | — |  |  | — |  |  |  |  |  |
Outstanding at September 30, 2021 |  | 509 |  | $ | 1.83 |  |  | 2.23 |  | $ | 567
Exercisable at September 30, 2021 |  | 338 |  | $ | 1.69 |  |  | 2.10 |  | $ | 423

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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