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Share-based Compensation

9 Months Ended

Sep. 30, 2020

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 nine months ended September 30, 2020 and 2019:


	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019

	(in thousands)
Cost of sales	$	389	$	383	$	1,384	$	1,448
Research and development		674		756		2,161		2,531
Selling, general, and administrative		1,879		2,644		6,017		7,549
Total	$	2,942	$	3,783	$	9,562	$	11,528

For the nine months ended September 30, 2020, equity activity related to stock options was as follows:


		Weighted
	Number of	Average
	Shares	Exercise Price
	(in thousands)
Balance - December 31, 2019	1,119		34.88
Expired or forfeited	(339)		33.94
Balance - September 30, 2020	780		35.28

For the nine months ended September 30, 2020, 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, 2019	2,257		16.20
Granted	1,006		9.40
Performance award adjustments	(51)		30.94
Vested	(775)		15.97
Forfeited	(366)		15.38
Balance - September 30, 2020	2,071		12.76