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Share-based compensation (Tables)

9 Months Ended

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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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

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-Publisher FASB
-Name Accounting Standards Codification
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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.

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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.

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