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Stock-Based Compensation Plans (Tables) | 6 Months Ended
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Jun. 30, 2020
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 June 30, |  | Six Months Ended June 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
| (in thousands) |  | (in thousands)
2007 Stock Incentive Plan | $ | 703 |  |  | $ | 1,143 |  |  | $ | 1,728 |  |  | $ | 2,402 |
2018 Stock Incentive Plan | 2,237 |  |  | 975 |  |  | 3,297 |  |  | 975 |
Employee Stock Purchase Plan | 75 |  |  | 4 |  |  | 107 |  |  | 10 |
Total Stock Compensation Expense | $ | 3,015 |  |  | $ | 2,122 |  |  | $ | 5,132 |  |  | $ | 3,387 |
Summary of restricted stock activity | The following table summarizes restricted stock activity under the 2007 and 2018 Plans during the six months ended June 30, 2020:
| Shares
Balance as of December 31, 2019 | 505,467 |
Shares granted | 307,600 |
Shares forfeited | — |
Shares vested | (229,414 | )
Balance as of June 30, 2020 | 583,653 |

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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=116856206&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=116856206&loc=d3e5070-113901 + Details
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