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Share-based Compensation | 3 Months Ended
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Mar. 31, 2021
Share-based Compensation |
Stock Plans | Note 8 — Share-based Compensation ​ Restricted share awards are issued to employees that are subject to specified restrictions and a risk of forfeiture. The restrictions typically lapse over one to five 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, 2021 and 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended March 31,
​ |  | 2021 |  | 2020
​ | ​ | (in thousands)
Cost of sales |  | $ | 495 |  | $ | 521
Research and development | ​ | ​ | 817 | ​ | ​ | 874
Selling, general, and administrative | ​ | ​ | 1,925 | ​ | ​ | 2,251
Total | ​ | $ | 3,237 | ​ | $ | 3,646
​ For the three months ended March 31, 2021, equity activity related to stock options was as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | Number of | ​ | Average
​ |  | Shares |  | Exercise Price
​ | ​ | (in thousands) | ​ | ​ | ​
Balance - December 31, 2020 | ​ | 730 | ​ | ​ | 35.26
Expired or forfeited | ​ | (33) | ​ | ​ | 35.37
Balance - March 31, 2021 | ​ | 697 | ​ | ​ | 35.26
​ For the three months ended March 31, 2021, 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, 2020 | ​ | 2,040 | ​ | ​ | 12.73
Granted | ​ | 813 | ​ | ​ | 23.97
Vested | ​ | (204) | ​ | ​ | 8.95
Forfeited | ​ | (39) | ​ | ​ | 13.15
Balance - March 31, 2021 | ​ | 2,610 | ​ | ​ | 16.52
​

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