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Share-based Compensation

6 Months Ended

Jun. 30, 2021

Note 8 — Share-based Compensation

Restricted share awards are issued to employees that are subject to specified restrictions and a risk of forfeiture. The restrictions typically lapse over one to five years and may entitle holders to dividends and voting rights. Other types of share-based compensation include performance share awards, performance share units, and restricted share units (collectively with restricted share awards, “restricted shares”), as well as options to purchase common stock.

Share-based compensation expense was recognized in the following line items in the Consolidated Statements of Operations for the three and six months ended June 30, 2021 and 2020:


	Three months ended June 30,				Six months ended June 30,
	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

For the six months ended June 30, 2021, equity activity related to stock options was as follows:


		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

For the six months ended June 30, 2021, equity activity related to non-vested restricted shares and performance shares was as follows:


		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