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Share-based Compensation (Tables)

9 Months Ended

Sep. 30, 2020

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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​

2020

2019

2020

2019

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​

(in thousands)

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Cost of sales

$

389

$

383

$

1,384

$

1,448

Research and development

​

​

674

​

​

756

​

​

2,161

​

​

2,531

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Selling, general, and administrative

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​

1,879

​

​

2,644

​

​

6,017

​

​

7,549

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Total

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$

2,942

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$

3,783

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$

9,562

​

$

11,528

​

Summary of stock option activity

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​	​	​	​	​	​
​	​	​	​	Weighted
​	​	Number of	​	Average
​		Shares		Exercise Price
​	​	(in thousands)	​	​	​
Balance - December 31, 2019	​	1,119	​	​	34.88
Expired or forfeited	​	(339)	​	​	33.94
Balance - September 30, 2020	​	780	​	​	35.28

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, 2019	​	2,257	​	​	16.20
Granted	​	1,006	​	​	9.40
Performance award adjustments	​	(51)	​	​	30.94
Vested	​	(775)	​	​	15.97
Forfeited	​	(366)	​	​	15.38
Balance - September 30, 2020	​	2,071	​	​	12.76

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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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