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Share-based compensation (Tables) | 3 Months Ended
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Mar. 31, 2019
Stock Plans |
Schedule of share-based compensation expense |
|  | Three months ended March 31, |
|  | 2019 |  | 2018 |
|  | (in thousands) |
Cost of sales |  | $ | 470 |  | $ | 554 |
Research and development |  |  | 792 |  |  | 954 |
Selling, general, and administrative |  |  | 1,895 |  |  | 2,857 |
Restructuring |  |  | — |  |  | 172 |
Total |  | $ | 3,157 |  | $ | 4,537 |
Summary of stock option activity |
|  |  |  | Weighted
|  | Number of |  | Average
|  | Shares |  | Exercise Price
|  | (in thousands) |  |  |
Balance - December 31, 2018 |  | 1,222 |  |  | 34.80
Expired or forfeited |  | (33) |  |  | 33.82
Balance - March 31, 2019 |  | 1,189 |  |  | 34.83
Summary of non-vested restricted and performance shares activity |
|  |  |  | Weighted
|  |  |  | Average
|  | Number of |  | Grant Date
|  | Shares |  | Fair Value
|  | (in thousands) |  |  |
Balance - December 31, 2018 |  | 2,218 |  |  | 20.74
Granted |  | 974 |  |  | 11.32
Performance award adjustments |  | (9) |  |  | 32.67
Vested |  | (156) |  |  | 21.71
Forfeited |  | (89) |  |  | 21.84
Balance - March 31, 2019 |  | 2,938 |  |  | 17.50

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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