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Share-based Compensation (Tables)

6 Months Ended

Jun. 30, 2021

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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2021

2020

2021

2020

​

​

(in thousands)

Cost of sales

$

650

$

474

$

1,146

$

995

Research and development

​

​

1,132

​

​

613

​

​

1,949

​

​

1,486

Selling, general, and administrative

​

​

2,585

​

​

1,887

​

​

4,510

​

​

4,139

Total

​

$

4,367

​

$

2,974

​

$

7,605

​

$

6,620

Summary of stock option activity

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​	​	​	​	​	​
​	​	​	​	Weighted
​	​	Number of	​	Average
​		Shares		Exercise Price
​	​	(in thousands)	​	​	​
Balance - December 31, 2020	​	730	​	​	35.26
Expired or forfeited	​	(280)	​	​	40.27
Balance - June 30, 2021	​	450	​	​	32.14

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, 2020	​	2,040	​	​	12.73
Granted	​	864	​	​	23.89
Performance award adjustments	​	(36)	​	​	19.75
Vested	​	(410)	​	​	13.69
Forfeited	​	(60)	​	​	14.25
Balance - June 30, 2021	​	2,398	​	​	16.45

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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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