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Share-based compensation | 6 Months Ended
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Jun. 30, 2018
Share-based compensation |
Share-based compensation | Note 9 - 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, 2018 and 2017:
|  | Three months ended June 30, |  | Six months ended June 30, |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |
|  | (in thousands) |
Cost of sales |  | $ | 536 |  | $ | 500 |  | $ | 1,090 |  | $ | 1,157 |
Research and development |  | 1,065 |  | 708 |  | 2,019 |  | 1,137 |
Selling, general, and administrative |  | 2,646 |  | 3,368 |  | 5,503 |  | 6,468 |
Restructuring |  | 657 |  | 841 |  | 829 |  | 841 |
Acquisition costs |  | — |  | 4,203 |  | — |  | 4,203 |
Total |  | $ | 4,904 |  | $ | 9,620 |  | $ | 9,441 |  | $ | 13,806 |
For the six months ended June 30, 2018, equity activity related to stock options was as follows:
|  | Number of |  | Weighted Average |
|  | Shares |  | Exercise Price |
|  | (in thousands) |  |  |
Balance - December 31, 2017 |  | 1,394 |  | $ | 34.97 |
Expired or forfeited |  | (118 | ) | 37.42 |
Balance - June 30, 2018 |  | 1,276 |  | $ | 34.75 |
For the six months ended June 30, 2018, 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, 2017 |  | 1,880 |  | $ | 25.41 |
Granted |  | 824 |  | 19.39 |
Performance award adjustments |  | (5 | ) | 32.67 |
Vested |  | (468 | ) | 26.19 |
Forfeited |  | (109 | ) | 26.06 |
Balance - June 30, 2018 |  | 2,122 |  | $ | 22.85 |

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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