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Stock-Based Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2022
Share-Based Payment Arrangement, Noncash Expense [Abstract] |
Schedule of Components of Stock Compensation Expense | The components of stock-based compensation expense were as follows:
| Three months ended September 30, |  | Nine months ended September 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
| (in thousands) |  | (in thousands)
2007 Stock Incentive Plan | $ | — |  |  | $ | 9 |  |  | $ | — |  |  | $ | 1,651 |
2021 Stock Incentive Plan | 3,098 |  |  | 4,517 |  |  | 10,732 |  |  | 10,023 |
Employee Stock Purchase Plan | 48 |  |  | 51 |  |  | 84 |  |  | 201 |
Total Stock Compensation Expense | $ | 3,146 |  |  | $ | 4,577 |  |  | $ | 10,816 |  |  | $ | 11,875 |
Summary of Restricted Stock Activity | The following table summarizes the restricted stock activity during the nine months ended September 30, 2022:
| Shares
Balance of unvested shares as of December 31, 2021 | 560,608 |
Shares granted | 330,400 |
Shares forfeited | — |
Shares vested | (368,810) |
Balance of unvested shares as of September 30, 2022 | 522,198 |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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 (h)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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 (c)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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