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Share-based compensation (Tables)

9 Months Ended

Sep. 30, 2019

Share-based compensation

Schedule of share-based compensation expense

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Three months ended September 30,

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Nine months ended September 30,

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2019

2018

2019

2018

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(in thousands)

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Cost of sales

$

383

$

513

$

1,448

$

1,603

Research and development

​

​

756

​

​

709

​

​

2,531

​

​

2,728

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Selling, general, and administrative

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​

2,644

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​

1,890

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​

7,549

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​

7,393

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Restructuring

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—

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​

167

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—

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​

996

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Total

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$

3,783

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$

3,279

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$

11,528

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$

12,720

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Summary of stock option activity

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​	​	​	​	​	​
​	​	​	​	Weighted
​	​	Number of	​	Average
​		Shares		Exercise Price
​	​	(in thousands)	​	​	​
Balance - December 31, 2018	​	1,222	​	$	34.80
Expired or forfeited	​	(69)	​	​	33.62
Balance - September 30, 2019	​	1,153	​	​	34.87

Summary of non-vested restricted and performance shares activity

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​	​	​	​	​	​
​		​		Weighted
​	​	​	​	Average
​	​	Number of	​	Grant Date
​	​	Shares	​	Fair Value
​	​	(in thousands)	​	​	​
Balance - December 31, 2018	​	2,218	​	$	20.74
Granted	​	1,048	​	​	11.41
Performance award adjustments	​	(25)	​	​	28.91
Vested	​	(721)	​	​	22.29
Forfeited	​	(176)	​	​	19.41
Balance - September 30, 2019	​	2,344	​	​	16.02

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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.

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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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