Share-based Compensation (Tables)

6 Months Ended

Jun. 30, 2022

Share-based Compensation

Schedule of share-based compensation expense

	Three months ended June 30,				Six months ended June 30,
	2022		2021		2022		2021
	(in thousands)
Cost of sales	$	1,251	$	650	$	2,189	$	1,146
Research and development		1,863		1,132		3,120		1,949
Selling, general, and administrative		3,164		2,585		5,450		4,510
Total	$	6,278	$	4,367	$	10,759	$	7,605

Summary of stock option activity

		Weighted
	Number of	Average
	Shares	Exercise Price
	(in thousands)
Balance - December 31, 2021	443	$	32.15
Expired	(261)		32.93
Balance - June 30, 2022	182		31.02

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	1,012		31.33
Performance award adjustments	85		14.03
Vested	(678)		15.71
Forfeited	(63)		19.38
Balance - June 30, 2022	2,439		23.42