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Stock-Based Compensation - Activity in the Stock Plan (Details) - shares | 6 Months Ended | 186 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2024
Employee Stock Award Plan-2008 |  |
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward] |  |
Beginning balance (in shares) | 1,150,834 | 1,900,000
Additional shares authorized (in shares) | 0 | 2,150,000
Number of awards granted (in shares) | (374,839) | (4,348,696)
Number of awards forfeited or expired (in shares) | 162,819 | 1,237,510
Ending balance (in shares) | 938,814 | 938,814
Number of unrestricted stock awards granted (in shares) | 374,839 | 4,348,696
Employee Stock Award Plan-2008 | Options Awards |  |
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward] |  |
Number of option awards exercised (in shares) | 0 | 1,537,336
Employee Stock Award Plan-2008 | Unrestricted Stock Awards |  |
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward] |  |
Number of awards granted (in shares) | 0 | (10,090)
Number of unrestricted stock awards granted (in shares) | 0 | 10,090
Employee Stock Award Plan-2008 | Restricted Stock Awards |  |
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward] |  |
Number of restricted stock awards vested (in shares) | 34,881 | 335,317
Director Plan - 2005 |  |
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward] |  |
Beginning balance (in shares) | 103,600 | 300,000
Additional shares authorized (in shares) | 0 | 150,000
Number of awards granted (in shares) | (32,190) | (418,808)
Number of awards forfeited or expired (in shares) | 0 | 40,218
Ending balance (in shares) | 71,410 | 71,410
Number of unrestricted stock awards granted (in shares) | 32,190 | 418,808
Director Plan - 2005 | Options Awards |  |
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward] |  |
Number of option awards exercised (in shares) | 0 | 152,336
Director Plan - 2005 | Restricted Stock Awards |  |
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward] |  |
Number of restricted stock awards vested (in shares) | 31,380 | 169,336

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Number of additional shares authorized for issuance under share-based payment arrangement. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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