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Stock-Based Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2021
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,
| 2021 |  | 2020 |  | 2021 |  | 2020
| (in thousands) |  | (in thousands)
2007 Stock Incentive Plan | $ | 9 |  |  | $ | 707 |  |  | $ | 1,651 |  |  | $ | 2,435 |
2018 Stock Incentive Plan | 4,517 |  |  | 2,329 |  |  | 10,023 |  |  | 5,626 |
Employee Stock Purchase Plan | 51 |  |  | 77 |  |  | 201 |  |  | 184 |
Total Stock Compensation Expense | $ | 4,577 |  |  | $ | 3,113 |  |  | $ | 11,875 |  |  | $ | 8,245 |
Summary of restricted stock activity | The following table summarizes restricted stock activity under the 2007 and 2018 Plans during the nine months ended September 30, 2021:
| Shares
Balance of unvested shares as of December 31, 2020 | 581,715 |
Shares granted | 286,550 |
Shares forfeited | — |
Shares vested | (339,657) |
Balance of unvested shares as of September 30, 2021 | 528,608 |

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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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