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Stock-Based Compensation Plans (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, |  |
| 2022 |  | 2021 |  |  |  |
| (in thousands) |  |
2007 Stock Incentive Plan | $ | — |  |  | $ | 685 |  |  |  |  |
2021 Stock Incentive Plan | 4,607 |  |  | 1,999 |  |  |  |  |
Employee Stock Purchase Plan | 22 |  |  | 78 |  |  |  |  |
Total Stock Compensation Expense | $ | 4,629 |  |  | $ | 2,762 |  |  |  |  |
Summary of restricted stock activity | The following table summarizes restricted stock activity during the three months ended March 31, 2022:
| Shares
Balance of unvested shares as of December 31, 2021 | 560,608 |
Shares granted | — |
Shares forfeited | — |
Shares vested | — |
Balance of unvested shares as of March 31, 2022 | 560,608 |

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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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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