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Share-based Compensation | 9 Months Ended
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Sep. 30, 2024
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 and nine months ended September 30, 2024 and 2023: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended September 30, | ​ | Nine months ended September 30, | ​
​ |  | 2024 |  | 2023 |  | 2024 |  | 2023 |
​ | ​ | (in thousands) | ​
Cost of sales |  | $ | 1,565 |  | $ | 1,556 |  | $ | 4,740 |  | $ | 4,579 |
Research and development | ​ | ​ | 3,111 | ​ | ​ | 2,158 | ​ | ​ | 8,422 | ​ | ​ | 6,815 | ​
Selling, general, and administrative | ​ | ​ | 4,783 | ​ | ​ | 3,706 | ​ | ​ | 13,612 | ​ | ​ | 10,985 | ​
Total | ​ | $ | 9,459 | ​ | $ | 7,420 | ​ | $ | 26,774 | ​ | $ | 22,379 | ​
​ For the nine months ended September 30, 2024, 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, 2023 | ​ | 2,464 | ​ | $ | 26.19
Granted | ​ | 1,173 | ​ | ​ | 38.01
Performance award adjustments | ​ | 200 | ​ | ​ | 27.81
Vested | ​ | (1,142) | ​ | ​ | 25.48
Forfeited | ​ | (81) | ​ | ​ | 27.97
Balance - September 30, 2024 | ​ | 2,614 | ​ | $ | 32.09
​

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