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Share-based compensation | 6 Months Ended
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Jun. 30, 2019
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, 2019 and 2018: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended June 30, | ​ | Six months ended June 30, | ​
​ |  | 2019 |  | 2018 |  | 2019 |  | 2018 |
​ | ​ | (in thousands) | ​
Cost of sales |  | $ | 595 |  | $ | 536 |  | $ | 1,065 |  | $ | 1,090 |
Research and development | ​ | ​ | 982 | ​ | ​ | 1,065 | ​ | ​ | 1,775 | ​ | ​ | 2,019 | ​
Selling, general, and administrative | ​ | ​ | 3,011 | ​ | ​ | 2,646 | ​ | ​ | 4,905 | ​ | ​ | 5,503 | ​
Restructuring | ​ | ​ | — | ​ | ​ | 657 | ​ | ​ | — | ​ | ​ | 829 | ​
Total | ​ | $ | 4,588 | ​ | $ | 4,904 | ​ | $ | 7,745 | ​ | $ | 9,441 | ​
​ For the six months ended June 30, 2019, equity activity related to stock options was as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | Number of | ​ | Average
​ |  | Shares |  | Exercise Price
​ | ​ | (in thousands) | ​ | ​ | ​
Balance - December 31, 2018 | ​ | 1,222 | ​ | $ | 34.80
Expired or forfeited | ​ | (69) | ​ | ​ | 33.62
Balance - June 30, 2019 | ​ | 1,153 | ​ | ​ | 34.87
​ For the six months ended June 30, 2019, 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, 2018 | ​ | 2,218 | ​ | $ | 20.74
Granted | ​ | 1,035 | ​ | ​ | 11.41
Performance award adjustments | ​ | (1) | ​ | ​ | 25.23
Vested | ​ | (589) | ​ | ​ | 22.35
Forfeited | ​ | (97) | ​ | ​ | 21.79
Balance - June 30, 2019 | ​ | 2,566 | ​ | ​ | 16.71
​

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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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