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Share-based Compensation | 9 Months Ended
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Sep. 30, 2020
Share-based Compensation |
Share-based compensation | 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 nine months ended September 30, 2020 and 2019: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended September 30, | ​ | Nine months ended September 30, | ​
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019 |
​ | ​ | (in thousands) | ​
Cost of sales |  | $ | 389 |  | $ | 383 |  | $ | 1,384 |  | $ | 1,448 |
Research and development | ​ | ​ | 674 | ​ | ​ | 756 | ​ | ​ | 2,161 | ​ | ​ | 2,531 | ​
Selling, general, and administrative | ​ | ​ | 1,879 | ​ | ​ | 2,644 | ​ | ​ | 6,017 | ​ | ​ | 7,549 | ​
Total | ​ | $ | 2,942 | ​ | $ | 3,783 | ​ | $ | 9,562 | ​ | $ | 11,528 | ​
​ For the nine months ended September 30, 2020, equity activity related to stock options was as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | Number of | ​ | Average
​ |  | Shares |  | Exercise Price
​ | ​ | (in thousands) | ​ | ​ | ​
Balance - December 31, 2019 | ​ | 1,119 | ​ | ​ | 34.88
Expired or forfeited | ​ | (339) | ​ | ​ | 33.94
Balance - September 30, 2020 | ​ | 780 | ​ | ​ | 35.28
​ For the nine months ended September 30, 2020, 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, 2019 | ​ | 2,257 | ​ | ​ | 16.20
Granted | ​ | 1,006 | ​ | ​ | 9.40
Performance award adjustments | ​ | (51) | ​ | ​ | 30.94
Vested | ​ | (775) | ​ | ​ | 15.97
Forfeited | ​ | (366) | ​ | ​ | 15.38
Balance - September 30, 2020 | ​ | 2,071 | ​ | ​ | 12.76
​

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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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