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Share-based Compensation | 3 Months Ended
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Mar. 31, 2023
Share-based Compensation |
Share-based compensation | Note 8 — Share-based Compensation ​ Restricted share awards are issued to employees and to members of our 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 months ended March 31, 2023 and 2022: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended March 31, | ​ | ​
​ |  | 2023 |  | 2022 |  |
​ | ​ | (in thousands) | ​
Cost of sales |  | $ | 1,451 |  | $ | 938 |  |
Research and development | ​ | ​ | 2,089 | ​ | ​ | 1,257 | ​ | ​
Selling, general, and administrative | ​ | ​ | 3,487 | ​ | ​ | 2,286 | ​ | ​
Total | ​ | $ | 7,027 | ​ | $ | 4,481 | ​ | ​
​ For the three months ended March 31, 2023, equity activity related to stock options was as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | Number of | ​ | Average
​ |  | Shares |  | Exercise Price
​ | ​ | (in thousands) | ​ | ​ | ​
Balance - December 31, 2022 | ​ | 177 | ​ | $ | 30.94
Expired | ​ | (1) | ​ | ​ | 30.47
Balance - March 31, 2023 | ​ | 176 | ​ | ​ | 30.94
​ For the three months ended March 31, 2023, 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, 2022 | ​ | 2,496 | ​ | $ | 23.83
Granted | ​ | 1,022 | ​ | ​ | 22.90
Performance award adjustments | ​ | 183 | ​ | ​ | 10.59
Vested | ​ | (1,012) | ​ | ​ | 16.22
Forfeited | ​ | (14) | ​ | ​ | 22.46
Balance - March 31, 2023 | ​ | 2,675 | ​ | ​ | 25.46
​

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