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Share-based compensation | 3 Months Ended
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Mar. 31, 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 months ended March 31, 2018 and 2017:
|  | Three months ended March 31, |
|  | 2018 |  | 2017 |
|  | (in thousands) |
Cost of sales |  | $ | 554 |  | $ | 657 |
Research and development |  | 954 |  | 429 |
Selling, general, and administrative |  | 2,857 |  | 3,100 |
Restructuring |  | 172 |  | — |
Total |  | $ | 4,537 |  | $ | 4,186 |
For the three months ended March 31, 2018, equity activity related to stock options was as follows:
|  |  |  | Weighted |
|  | Number of |  | Average |
|  | Shares |  | Exercise Price |
|  | (in thousands) |  |  |
Balance - December 31, 2017 |  | 1,394 |  | $ | 34.97 |
Expired or forfeited |  | (53 | ) | 35.45 |
Balance - March 31, 2018 |  | 1,341 |  | $ | 34.95 |
For the three months ended March 31, 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 |  | 759 |  | 19.69 |
Performance award adjustments |  | (5 | ) | 32.67 |
Vested |  | (44 | ) | 28.46 |
Forfeited |  | (55 | ) | 25.87 |
Balance - March 31, 2018 |  | 2,535 |  | $ | 23.62 |

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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 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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