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Share-based Compensation (Tables)

3 Months Ended

Mar. 31, 2022

Share-based Compensation

Schedule of share-based compensation expense

​

​	​	​	​	​	​	​	​	​
​	​	Three months ended March 31,					​	​
​		2022			2021
​	​	(in thousands)						​
Cost of sales		$	938		$	495
Research and development	​	​	1,257	​	​	817	​	​
Selling, general, and administrative	​	​	2,286	​	​	1,925	​	​
Total	​	$	4,481	​	$	3,237	​	​

Summary of stock option activity

​

​	​	​	​	​	​
​	​	​	​	Weighted
​	​	Number of	​	Average
​		Shares		Exercise Price
​	​	(in thousands)	​	​	​
Balance - December 31, 2021	​	443	​	$	32.15
Expired	​	(4)	​	​	31.01
Balance - March 31, 2022	​	439	​	​	32.16

Summary of non-vested restricted and performance shares activity

​

​	​	​	​	​	​
​		​		Weighted
​	​	​	​	Average
​	​	Number of	​	Grant Date
​	​	Shares	​	Fair Value
​	​	(in thousands)	​	​	​
Balance - December 31, 2021	​	2,083	​	$	17.33
Granted	​	896	​	​	32.60
Performance award adjustments	​	85	​	​	14.03
Vested	​	(600)	​	​	15.53
Forfeited	​	(23)	​	​	17.53
Balance - March 31, 2022	​	2,441	​	​	23.26

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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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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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