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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2021
Stockholders' Equity |
Schedule of Share-based Payment Arrangement, Nonemployee Director Award Plan, Activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Shares Available | ​ | Compensation
​ | ​ | for Grant | ​ | Cost
​ | ​ | ​ | ​ | ​ | ​ | ​
Balance, December 31, 2018 | ​ | ​ | 1,944,428 | ​ | $ | —
Shares granted 2019 | ​ | ​ | (38,046) | ​ | ​ | 337,500
Balance December 31, 2019 | ​ | ​ | 1,906,382 | ​ | $ | 337,500
Shares granted 2020 | ​ | ​ | (58,998) | ​ | ​ | 337,500
Balance December 31, 2020 | ​ | ​ | 1,847,384 | ​ | $ | 675,000
Shares granted 2021 | ​ | ​ | (66,564) | ​ | ​ | 337,500
Balance December 31, 2021 | ​ | ​ | 1,780,820 | ​ | $ | 1,012,500
​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of repurchase of common stock | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(Cost in thousands) | ​ | ​ | Shares Repurchased | ​ | Cost
Balance December 31, 2020 |  | ​ | 1,017,498 |  | $ | 18,775
Repurchase of shares | ​ | ​ | 3,396,243 | ​ | ​ | 18,244
Balance, December 31, 2021 | ​ | ​ | 4,413,741 | ​ | $ | 37,019

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock awards granted to nonemployee directors that were outstanding at the beginning and end of the year, and the number of awards that were granted, exercised or converted, forfeited, and expired during the year. + 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 (g) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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