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Share-based compensation (Tables) | 6 Months Ended
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Jun. 30, 2018
Share-based compensation |
Schedule of share-based compensation expense |
|  | 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 |
Summary of stock option activity |
|  | 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 |
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 |  | 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 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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