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Share-based compensation | 6 Months Ended
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Jun. 30, 2017
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, 2017 and 2016:
|  | Three months ended June 30, |  | Six months ended June 30, |
|  | 2017 |  | 2016 |  | 2017 |  | 2016 |
|  | (in thousands) |
Cost of sales |  | $ | 500 |  | $ | 486 |  | $ | 1,157 |  | $ | 1,032 |
Research and development |  | 708 |  | 940 |  | 1,137 |  | 2,039 |
Selling, general, and administrative |  | 3,368 |  | 2,576 |  | 6,468 |  | 5,319 |
Restructuring |  | 841 |  | — |  | 841 |  | — |
Acquisition costs |  | 4,203 |  | — |  | 4,203 |  | — |
Total |  | $ | 9,620 |  | $ | 4,002 |  | $ | 13,806 |  | $ | 8,390 |
For the six months ended June 30, 2017, equity activity related to stock options was as follows:
|  | Number of |  | Weighted Average |
|  | Shares |  | Exercise Price |
|  | (in thousands) |  |  |
Balance - December 31, 2016 |  | 1,576 |  | $ | 35.18 |
Granted |  | — |  | — |
Exercised |  | (18 | ) | 30.03 |
Expired or forfeited |  | (120 | ) | 37.14 |
Balance - June 30, 2017 |  | 1,438 |  | 35.08 |
For the six months ended June 30, 2017, 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, 2016 |  | 1,949 |  | $ | 23.85 |
Granted |  | 649 |  | 29.67 |
Assumed from Ultratech |  | 338 |  | 31.75 |
Vested |  | (549 | ) | 25.98 |
Forfeited |  | (130 | ) | 25.95 |
Balance - June 30, 2017 |  | 2,257 |  | 25.94 |

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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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