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Share-based Compensation | 6 Months Ended
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Jun. 30, 2022
Share-based Compensation |
Share-based compensation | Note 8 — Share-based Compensation ​ Restricted share awards are issued to employees and board of directors that are subject to specified restrictions and a risk of forfeiture. The restrictions typically lapse over one to four years and may entitle holders to dividends and voting rights. Other types of share-based compensation include performance share awards, performance share units, and restricted share units (collectively with restricted share awards, “restricted shares”), as well as options to purchase common stock. ​ Share-based compensation expense was recognized in the following line items in the Consolidated Statements of Operations for the three and six months ended June 30, 2022 and 2021: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended June 30, | ​ | Six months ended June 30, | ​
​ |  | 2022 |  | 2021 |  | 2022 |  | 2021 |
​ | ​ | (in thousands) | ​
Cost of sales |  | $ | 1,251 |  | $ | 650 |  | $ | 2,189 |  | $ | 1,146 |
Research and development | ​ | ​ | 1,863 | ​ | ​ | 1,132 | ​ | ​ | 3,120 | ​ | ​ | 1,949 | ​
Selling, general, and administrative | ​ | ​ | 3,164 | ​ | ​ | 2,585 | ​ | ​ | 5,450 | ​ | ​ | 4,510 | ​
Total | ​ | $ | 6,278 | ​ | $ | 4,367 | ​ | $ | 10,759 | ​ | $ | 7,605 | ​
​ For the six months ended June 30, 2022, equity activity related to stock options was as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | Number of | ​ | Average
​ |  | Shares |  | Exercise Price
​ | ​ | (in thousands) | ​ | ​ | ​
Balance - December 31, 2021 | ​ | 443 | ​ | $ | 32.15
Expired | ​ | (261) | ​ | ​ | 32.93
Balance - June 30, 2022 | ​ | 182 | ​ | ​ | 31.02
​ For the six months ended June 30, 2022, equity activity related to non-vested restricted shares and performance shares was as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | Number of | ​ | Grant Date
​ | ​ | Shares | ​ | Fair Value
​ | ​ | (in thousands) | ​ | ​ | ​
Balance - December 31, 2021 | ​ | 2,083 | ​ | $ | 17.33
Granted | ​ | 1,012 | ​ | ​ | 31.33
Performance award adjustments | ​ | 85 | ​ | ​ | 14.03
Vested | ​ | (678) | ​ | ​ | 15.71
Forfeited | ​ | (63) | ​ | ​ | 19.38
Balance - June 30, 2022 | ​ | 2,439 | ​ | ​ | 23.42
​

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