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Stock Award Plans and Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Stock Award Plans and Stock Based Compensation |
Schedule of estimated weighted-average assumptions used in calculation of fair value of options granted | ​
​ | ​ | ​ | ​
​ | ​ | Year ended December 31, | ​
​ |  | 2021 | ​
Weighted-average expected volatility | ​ | 53.07% | ​
Weighted-average expected term | ​ | 4.71 years | ​
Risk-free interest rate | ​ | 1.22% | ​
Expected dividend yield | ​ | 0.00% | ​
Summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted |  | ​ | ​ |
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | ​ | ​ |
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Aggregate |
​ | ​ | ​ | ​ | Exercise | ​ | Contractual | ​ | Intrinsic |
​ | ​ | Options | ​ | Price | ​ | Term | ​ | Value |
​ | ​ | (in thousands) | ​ | ​ | ​ | ​ | (years) | ​ | (in thousands) |
Outstanding at December 31, 2020 |  | 504 | ​ | $ | 9.93 | ​ | ​ | ​ | ​ | ​ | ​
Granted |  | 3 | ​ |  | 61.81 | ​ | ​ | ​ | ​ | ​ | ​
Exercised |  | (396) | ​ |  | 9.31 | ​ | ​ | ​ | ​ | ​ | ​
Canceled |  | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | ​
Expired |  | — | ​ |  | — | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2021 |  | 111 | ​ | $ | 13.51 |  | 0.73 | ​ | $ | 6,792 | ​
Exercisable at December 31, 2021 |  | 108 | ​ | $ | 12.17 |  | 0.56 | ​ | $ | 6,753 | ​
Options Vested at December 31, 2021 |  | 108 | ​ | $ | 12.17 |  | 0.56 | ​ | $ | 6,753 | ​
​
Schedule of changes in the Company's non-vested restricted stock units | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted-Average |
​ | ​ | ​ | ​ | Grant Date Fair |
​ | ​ | Shares/units | ​ | Value per Share |
​ | ​ | (in thousands) | ​ | ​ | ​ | ​
Outstanding at December 31, 2020 |  | 1,089 | ​ | $ | 20.77 | ​
Granted |  | 318 | ​ |  | 38.54 | ​
Vested |  | (496) | ​ |  | 21.32 | ​
Forfeited |  | (12) | ​ |  | 19.76 | ​
Outstanding at December 31, 2021 |  | 899 | ​ | $ | 26.74 | ​

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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