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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2022
Share-Based Payment Arrangement [Abstract] |
Summary of changes in the Company's stock option awards | The Company has outstanding stock options assumed from acquisitions. A summary of the status of, and changes in, the Company's stock option awards for the nine months ended September 30, 2022, follows:
| Shares |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Life
Options outstanding at December 31, 2021 | 31,386 |  | $ | 23.53 |  |  | 4.88
Expired | (440) |  | 23.53 |  |  |
Options outstanding at September 30, 2022 | 30,946 |  | $ | 23.53 |  |  | 4.13
Options exercisable at September 30, 2022 | 30,946 |  | $ | 23.53 |  |  | 4.13
Summary of changes in the Company's RSU, PSU, and DSU awards | A summary of changes in the Company’s RSU, PSU, and DSU awards for the nine months ended September 30, 2022, is as follows:
| RSU Awards |  | PSU Awards |  | DSU Awards
| Shares |  | Weighted- Average Grant Date Fair Value |  | Shares 1 |  | Weighted- Average Grant Date Fair Value |  | Shares |  | Weighted- Average Grant Date Fair Value
Nonvested at December 31, 2021 | 1,147,927 |  | $ | 23.97 |  |  | 113,915 |  | $ | 22.86 |  |  | 34,135 |  | $ | 24.59 |
Granted | 156,483 |  | 25.79 |  |  | 195,240 |  | 26.14 |  |  | 32,658 |  | 25.79 |
Dividend equivalents earned | 33,690 |  | 24.56 |  |  | — |  | — |  |  | 4,156 |  | 24.47 |
Vested | (152,992) |  | 28.93 |  |  | — |  | — |  |  | (40,140) |  | 24.67 |
Forfeited | (35,172) |  | 23.51 |  |  | (4,556) |  | 24.86 |  |  | — |  | — |
Nonvested at September 30, 2022 | 1,149,936 |  | $ | 23.59 |  |  | 304,599 |  | $ | 24.93 |  |  | 30,809 |  | $ | 25.75 |
Vested and outstanding at September 30, 2022 |  |  |  |  |  |  |  |  | 116,285 |  | $ | 22.82 |
1.Shares for PSU awards represent target shares at grant date.
Schedule of Stock-based compensation expense | The Company recognized compensation expense related to nonvested RSU, PSU, and DSU awards, as well as the 2021 ESPP, as summarized in the table below (dollars in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
Stock-based compensation expense |  |  |  |  |  |  |
RSU awards | $ | 1,072 |  |  | $ | 1,316 |  |  | $ | 3,521 |  |  | $ | 4,362 |
PSU awards 1 | 1,172 |  |  | 290 |  |  | 2,342 |  |  | 619 |
DSU awards | 196 |  |  | 231 |  |  | 679 |  |  | 741 |
2021 ESPP | 36 |  |  | 54 |  |  | 179 |  |  | 54 |
Total stock-based compensation expense | $ | 2,476 |  |  | $ | 1,891 |  |  | $ | 6,721 |  |  | $ | 5,776 |
1.Expense for market-based PSU awards represents amounts based on target shares at grant date. Expense for performance-based PSU awards represents amounts based on target shares at grant date, adjusted for performance expectations as of the date indicated.
Schedule of Unamortized stock-based compensation expense | Unamortized compensation expense related to nonvested RSU, PSU, and DSU awards is summarized in the table below (dollars in thousands):
| As of
| September 30, 2022 |  | December 31, 2021
Unamortized stock-based compensation |  |  |
RSU awards | $ | 9,966 |  |  | $ | 10,204 |
PSU awards 1 | 5,279 |  |  | 1,547 |
DSU awards | 371 |  |  | 209 |
Total unamortized stock-based compensation | $ | 15,616 |  |  | $ | 11,960 |
Weighted average period over which expense is to be recognized | 2.6 yrs |  | 2.9 yrs
1.Unamortized expense for market-based PSU awards represents amounts based on target shares at grant date. Unamortized expense for performance-based PSU awards represents amounts based on target shares at grant date, adjusted for performance expectations as of the date indicated.
Schedule of shares remaining available for issuance pursuant to authorized plans | Shares remaining available for issuance pursuant to authorized stock-based compensation plans were as follows as of September 30, 2022:
Plan |  | Shares Remaining Available for Issuance Pursuant to the Plan
2020 Equity Plan |  | 645,563
2021 Employee Stock Purchase Plan |  | 519,577

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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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