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Share-based Compensation | 6 Months Ended
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Jun. 30, 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 and six months ended June 30, 2021 and 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended June 30, | ​ | Six months ended June 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
​ | ​ | (in thousands)
Cost of sales |  | $ | 650 |  | $ | 474 |  | $ | 1,146 |  | $ | 995
Research and development | ​ | ​ | 1,132 | ​ | ​ | 613 | ​ | ​ | 1,949 | ​ | ​ | 1,486
Selling, general, and administrative | ​ | ​ | 2,585 | ​ | ​ | 1,887 | ​ | ​ | 4,510 | ​ | ​ | 4,139
Total | ​ | $ | 4,367 | ​ | $ | 2,974 | ​ | $ | 7,605 | ​ | $ | 6,620
​ For the six months ended June 30, 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 | ​ | (280) | ​ | ​ | 40.27
Balance - June 30, 2021 | ​ | 450 | ​ | ​ | 32.14
​ For the six months ended June 30, 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 | ​ | 864 | ​ | ​ | 23.89
Performance award adjustments | ​ | (36) | ​ | ​ | 19.75
Vested | ​ | (410) | ​ | ​ | 13.69
Forfeited | ​ | (60) | ​ | ​ | 14.25
Balance - June 30, 2021 | ​ | 2,398 | ​ | ​ | 16.45
​

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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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