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Share-based compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Share-based compensation |
Schedule of share-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended June 30, | ​ | Six months ended June 30, | ​
​ |  | 2019 |  | 2018 |  | 2019 |  | 2018 |
​ | ​ | (in thousands) | ​
Cost of sales |  | $ | 595 |  | $ | 536 |  | $ | 1,065 |  | $ | 1,090 |
Research and development | ​ | ​ | 982 | ​ | ​ | 1,065 | ​ | ​ | 1,775 | ​ | ​ | 2,019 | ​
Selling, general, and administrative | ​ | ​ | 3,011 | ​ | ​ | 2,646 | ​ | ​ | 4,905 | ​ | ​ | 5,503 | ​
Restructuring | ​ | ​ | — | ​ | ​ | 657 | ​ | ​ | — | ​ | ​ | 829 | ​
Total | ​ | $ | 4,588 | ​ | $ | 4,904 | ​ | $ | 7,745 | ​ | $ | 9,441 | ​
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 | ​ | (69) | ​ | ​ | 33.62
Balance - June 30, 2019 | ​ | 1,153 | ​ | ​ | 34.87
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 | ​ | 1,035 | ​ | ​ | 11.41
Performance award adjustments | ​ | (1) | ​ | ​ | 25.23
Vested | ​ | (589) | ​ | ​ | 22.35
Forfeited | ​ | (97) | ​ | ​ | 21.79
Balance - June 30, 2019 | ​ | 2,566 | ​ | ​ | 16.71
​

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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=116856206&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=116856206&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=116856206&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=116856206&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=116856206&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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