Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2017

Stock-Based Compensation

Summary of option activity

	Number of	Weighted-Average
	Shares	Exercise Price
	(In thousands)
Balance at December 31, 2016	3,606	$	25.07
Options granted	684	$	27.84
Options exercised	(460)	$	21.20
Options forfeited	(19)	$	28.30
Options expired	(4)	$	20.08
Balance at June 30, 2017	3,807	$	26.02
Exercisable at June 30, 2017	2,502	$	24.96
Vested and expected to vest at June 30, 2017	3,707	$	25.98

Summary of RSU activity

		Weighted-Average
	Number of	Grant Date Fair
	Shares	Value
	(In thousands)
Balance at December 31, 2016	871	$	28.42
RSUs granted	538	$	27.97
RSUs vested	(346)	$	28.70
RSUs cancelled	(51)	$	28.41
Balance at June 30, 2017	1,012	$	28.09

Schedule of share-based compensation expense

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2017		2016		2017		2016
	(In thousands)				(In thousands)
Cost of product revenues	$	170	$	152	$	361	$	312
Research and development		1,443		1,269		2,831		2,522
Selling and marketing		1,478		1,437		2,989		2,875
General and administrative		2,106		1,989		4,121		3,680
Total	$	5,197	$	4,847	$	10,302	$	9,389