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Share-based compensation

9 Months Ended

Sep. 30, 2019

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, 2019 and 2018:


	Three months ended September 30,				Nine months ended September 30,
	2019		2018		2019		2018
	(in thousands)
Cost of sales	$	383	$	513	$	1,448	$	1,603
Research and development		756		709		2,531		2,728
Selling, general, and administrative		2,644		1,890		7,549		7,393
Restructuring		—		167		—		996
Total	$	3,783	$	3,279	$	11,528	$	12,720

For the nine months ended September 30, 2019, equity activity related to stock options was as follows:


		Weighted
	Number of	Average
	Shares	Exercise Price
	(in thousands)
Balance - December 31, 2018	1,222	$	34.80
Expired or forfeited	(69)		33.62
Balance - September 30, 2019	1,153		34.87

For the nine months ended September 30, 2019, 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, 2018	2,218	$	20.74
Granted	1,048		11.41
Performance award adjustments	(25)		28.91
Vested	(721)		22.29
Forfeited	(176)		19.41
Balance - September 30, 2019	2,344		16.02