Stock-Based Compensation (Tables)

9 Months Ended

Sep. 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	727	$	28.09
Options exercised	(569)	$	20.95
Options forfeited	(72)	$	28.12
Options expired	(4)	$	20.08
Balance at September 30, 2017	3,688	$	26.24
Exercisable at September 30, 2017	2,479	$	25.33
Vested and expected to vest at September 30, 2017	3,604	$	26.20

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	572	$	28.24
RSUs vested	(367)	$	28.59
RSUs cancelled	(90)	$	28.30
Balance at September 30, 2017	986	$	28.26

Schedule of share-based compensation expense

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
	(In thousands)				(In thousands)
Cost of product revenues	$	187	$	155	$	548	$	501
Research and development		1,378		1,108		4,209		3,596
Selling and marketing		1,325		1,359		4,315		4,234
General and administrative		2,065		2,091		6,185		5,771
Total	$	4,955	$	4,713	$	15,257	$	14,102