Share-based Compensation (Tables)

9 Months Ended

Sep. 30, 2022

Share-based Compensation

Schedule of share-based compensation expense

	Three months ended September 30,				Nine months ended September 30,
	2022		2021		2022		2021
	(in thousands)
Cost of sales	$	1,195	$	620	$	3,384	$	1,765
Research and development		1,819		1,007		4,939		2,957
Selling, general, and administrative		3,196		2,504		8,646		7,013
Total	$	6,210	$	4,131	$	16,969	$	11,735

Summary of stock option activity

		Weighted
	Number of	Average
	Shares	Exercise Price
	(in thousands)
Balance - December 31, 2021	443	$	32.15
Expired	(266)		32.95
Balance - September 30, 2022	177		30.94

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	1,060		30.84
Performance award adjustments	85		14.03
Vested	(787)		15.21
Forfeited	(73)		19.85
Balance - September 30, 2022	2,368		23.88