Share-based compensation

9 Months Ended

Sep. 30, 2018

Note 9 — 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, 2018 and 2017:


	Three months ended September 30,				Nine months ended September 30,
	2018		2017		2018		2017
	(in thousands)
Cost of sales	$	513	$	740	$	1,603	$	1,898
Research and development		709		849		2,728		1,986
Selling, general, and administrative		1,890		3,714		7,393		10,182
Restructuring		167		867		996		1,707
Acquisition costs		—		—		—		4,203
Total	$	3,279	$	6,170	$	12,720	$	19,976

For the nine months ended September 30, 2018, equity activity related to stock options was as follows:


		Weighted
	Number of	Average
	Shares	Exercise Price
	(in thousands)
Balance - December 31, 2017	1,394	$	34.97
Expired or forfeited	(147)		36.50
Balance - September 30, 2018	1,247		34.79

For the nine months ended September 30, 2018, 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, 2017	1,880	$	25.41
Granted	835		19.31
Performance award adjustments	(5)		32.67
Vested	(508)		26.44
Forfeited	(253)		24.83
Balance - September 30, 2018	1,949		22.59