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Share-based compensation (Tables) | 9 Months Ended
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Sep. 30, 2018
Share-based compensation |
Schedule of share-based compensation expense |
|  | Three months ended September 30, |  | Nine months ended September 30, |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |
|  | (in thousands) |
Cost of sales |  | $ | 513 |  | $ | 740 |  | $ | 1,603 |  | $ | 1,898 |
Research and development |  |  | 709 |  |  | 849 |  |  | 2,728 |  |  | 1,986 |
Selling, general, and administrative |  |  | 1,890 |  |  | 3,714 |  |  | 7,393 |  |  | 10,182 |
Restructuring |  |  | 167 |  |  | 867 |  |  | 996 |  |  | 1,707 |
Acquisition costs |  |  | — |  |  | — |  |  | — |  |  | 4,203 |
Total |  | $ | 3,279 |  | $ | 6,170 |  | $ | 12,720 |  | $ | 19,976 |
Summary of stock option activity |
|  |  |  | Weighted
|  | Number of |  | Average
|  | Shares |  | Exercise Price
|  | (in thousands) |  |  |
Balance - December 31, 2017 |  | 1,394 |  | $ | 34.97
Expired or forfeited |  | (147) |  |  | 36.50
Balance - September 30, 2018 |  | 1,247 |  |  | 34.79
Summary of restricted and performance shares activity |
|  |  |  | Weighted
|  |  |  | Average
|  | Number of |  | Grant Date
|  | Shares |  | Fair Value
|  | (in thousands) |  |  |
Balance - December 31, 2017 |  | 1,880 |  | $ | 25.41
Granted |  | 835 |  |  | 19.31
Performance award adjustments |  | (5) |  |  | 32.67
Vested |  | (508) |  |  | 26.44
Forfeited |  | (253) |  |  | 24.83
Balance - September 30, 2018 |  | 1,949 |  |  | 22.59

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 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.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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