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Share-based compensation (Tables)

3 Months Ended

Mar. 31, 2018

Share-based compensation

Schedule of share-based compensation expense

		Three months ended March 31,
		2018			2017
		(in thousands)
Cost of sales		$	554		$	657
Research and development		954			429
Selling, general, and administrative		2,857			3,100
Restructuring		172			—
Total		$	4,537		$	4,186

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		(53	)	35.45
Balance - March 31, 2018		1,341		$	34.95

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		759		19.69
Performance award adjustments		(5	)	32.67
Vested		(44	)	28.46
Forfeited		(55	)	25.87
Balance - March 31, 2018		2,535		$	23.62

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- References

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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=6415400&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=6415400&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

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- Definition

Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ 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 (c)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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

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