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Stock-Based Compensation Plans (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, |  |
| 2021 |  | 2020 |  |  |  |
| (in thousands) |  |
2007 Stock Incentive Plan | $ | 685 |  |  | $ | 1,025 |  |  |  |  |
2018 Stock Incentive Plan | 1,999 |  |  | 1,060 |  |  |  |  |
Employee Stock Purchase Plan | 78 |  |  | 32 |  |  |  |  |
Total Stock Compensation Expense | $ | 2,762 |  |  | $ | 2,117 |  |  |  |  |
Summary of restricted stock activity | The following table summarizes restricted stock activity under the 2007 and 2018 Plans during the three months ended March 31, 2021:
| Shares
Balance as of December 31, 2020 | 581,715 |
Shares granted | — |
Shares forfeited | — |
Shares vested | (4,333) |
Balance as of March 31, 2021 | 577,382 |

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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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