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Share-based Compensation | 3 Months Ended
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Mar. 31, 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 months ended March 31, 2022 and 2021: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended March 31, | ​ | ​
​ |  | 2022 |  | 2021 |  |
​ | ​ | (in thousands) | ​
Cost of sales |  | $ | 938 |  | $ | 495 |  |
Research and development | ​ | ​ | 1,257 | ​ | ​ | 817 | ​ | ​
Selling, general, and administrative | ​ | ​ | 2,286 | ​ | ​ | 1,925 | ​ | ​
Total | ​ | $ | 4,481 | ​ | $ | 3,237 | ​ | ​
​ For the three months ended March 31, 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 | ​ | (4) | ​ | ​ | 31.01
Balance - March 31, 2022 | ​ | 439 | ​ | ​ | 32.16
​ For the three months ended March 31, 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 | ​ | 896 | ​ | ​ | 32.60
Performance award adjustments | ​ | 85 | ​ | ​ | 14.03
Vested | ​ | (600) | ​ | ​ | 15.53
Forfeited | ​ | (23) | ​ | ​ | 17.53
Balance - March 31, 2022 | ​ | 2,441 | ​ | ​ | 23.26
​

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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