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Share-based Compensation | 6 Months Ended
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Jun. 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 six months ended June 30, 2020 and 2019: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended June 30, | ​ | Six months ended June 30, | ​
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019 |
​ | ​ | (in thousands) | ​
Cost of sales |  | $ | 474 |  | $ | 595 |  | $ | 995 |  | $ | 1,065 |
Research and development | ​ | ​ | 613 | ​ | ​ | 982 | ​ | ​ | 1,486 | ​ | ​ | 1,775 | ​
Selling, general, and administrative | ​ | ​ | 1,887 | ​ | ​ | 3,011 | ​ | ​ | 4,139 | ​ | ​ | 4,905 | ​
Total | ​ | $ | 2,974 | ​ | $ | 4,588 | ​ | $ | 6,620 | ​ | $ | 7,745 | ​
​ For the six months ended June 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 | ​ | (324) | ​ | ​ | 33.96
Balance - June 30, 2020 | ​ | 795 | ​ | ​ | 35.25
​ For the six months ended June 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 | ​ | 983 | ​ | ​ | 9.32
Performance award adjustments | ​ | (45) | ​ | ​ | 31.34
Vested | ​ | (572) | ​ | ​ | 15.95
Forfeited | ​ | (348) | ​ | ​ | 15.47
Balance - June 30, 2020 | ​ | 2,275 | ​ | ​ | 13.10
​

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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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