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Share-based compensation (Tables)

6 Months Ended

Jun. 30, 2019

Share-based compensation

Schedule of share-based compensation expense

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Three months ended June 30,

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Six months ended June 30,

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2019

2018

2019

2018

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(in thousands)

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Cost of sales

$

595

$

536

$

1,065

$

1,090

Research and development

​

​

982

​

​

1,065

​

​

1,775

​

​

2,019

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Selling, general, and administrative

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​

3,011

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​

2,646

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​

4,905

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​

5,503

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Restructuring

​

​

—

​

​

657

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—

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​

829

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Total

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$

4,588

​

$

4,904

​

$

7,745

​

$

9,441

​

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 - June 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	​	1,035	​	​	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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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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