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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The total fair value of options granted during the years ended December 31, 2020, 2019 and 2018 was $1,066, $50, and $143 respectively, based on the following assumptions and weighted average fair values:
|  | December 31,
|  | 2020 |  | 2019 |  | 2018
Weighted Average Fair Value of Grants |  | $ | 3.56 |  |  | $ | 3.48 |  |  | $ | 6.50 |
Risk-free Interest Rate |  | 1.61 | % |  | 2.13 | % |  | 2.66 | %
Expected Dividend Yield |  | — | % |  | — | % |  | — | %
Expected Forfeiture Rate |  | — | % |  | — | % |  | — | %
Expected Volatility |  | 55.33 | % |  | 43.60 | % |  | 52.68 | %
Expected Term in Years |  | 5.11 |  | 6.50 |  | 3.71
Share-based Compensation, Stock Options, Activity | A summary of the status of stock options granted is presented below:
|  |  |  |  |  | Weighted |  |
|  |  |  |  |  | Average |  |
|  |  |  | Weighted |  | Remaining |  | Aggregate
|  |  |  | Average |  | Contractual |  | Intrinsic
|  |  |  | Exercise |  | Term (in |  | Value (in
|  | Shares |  | Price |  | years) |  | thousands)
Outstanding at December 31, 2019 |  | 4,696,264 |  |  | $ | 18.05 |  |  |  |  |
Granted |  | 299,541 |  |  | $ | 10.46 |  |  |  |  |
Exercised |  | (298,513) |  |  | $ | 6.87 |  |  |  |  |
Forfeited |  | (3,561) |  |  | $ | 10.53 |  |  |  |  |
Expired |  | (493,222) |  |  | $ | 43.53 |  |  |  |  |
Outstanding at December 31, 2020 |  | 4,200,509 |  |  | $ | 15.32 |  |  | 4.18 |  | $ | 9,430 |
Exercisable at December 31, 2020 |  | 3,908,444 |  |  | $ | 15.68 |  |  | 3.81 |  | $ | 9,330 |
Schedule of Nonvested Restricted Stock Units Activity | The following table represents the nonvested restricted stock units and their corresponding fair value (based upon the closing share price) at the date of grant:
|  | Number of |  | Weighted Average
|  | Shares |  | Grant Date Fair Value
Nonvested at December 31, 2019 |  | 1,033,200 |  |  | $11.71
Granted |  | 1,251,065 |  |  | $8.49
RSUs granted in conversion, as a result of the CNXM Merger |  | 204,619 |  |  | $18.01
Vested |  | (577,834) |  |  | $10.95
Forfeited |  | (39,923) |  |  | $9.65
Nonvested at December 31, 2020 |  | 1,871,127 |  |  | $10.10
Schedule of Nonvested Performance-based Units Activity | The following table represents the nonvested performance share units and their corresponding fair value (based upon the Monte Carlo Methodology) on the date of grant:
|  | Number of |  | Weighted Average
|  | Shares |  | Grant Date Fair Value
Nonvested at December 31, 2019 |  | 1,400,836 |  |  | $18.91
Granted |  | 660,634 |  |  | $5.79
PSUs Issued |  | 112,158 |  |  | $20.39
Vested |  | (274,716) |  |  | $20.82
Forfeited |  | (131,474) |  |  | $18.37
Nonvested at December 31, 2020 |  | 1,767,438 |  |  | $13.85

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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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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