Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2016

Summary of option activity

	Outstanding Options
	Number of	Weighted-Average
	Shares	Exercise Price
	(In thousands)
Balance at December 31, 2015	3,630	$	23.80
Options granted	583	$	27.00
Options exercised	(36)	$	17.72
Options forfeited	(11)	$	29.94
Options expired	(3)	$	20.64
Balance at March 31, 2016	4,163	$	24.29
Exercisable at March 31, 2016	3,023	$	22.66
Vested and expected to vest at March 31, 2016	4,033	$	24.16

Summary of RSU activity

		Weighted-Average
	Number of	Grant Date Fair
	Shares	Value
	(In thousands)
Balance at December 31, 2015	682	$	30.18
RSUs granted	526	$	27.55
RSUs vested	(266)	$	30.31
RSUs cancelled	(17)	$	30.18
Balance at March 31, 2016	925	$	28.65

Schedule of share-based compensation expense

	Three Months Ended
	March 31,
	2016		2015
	(In thousands)
Cost of product revenues	$	160	$	135
Research and development		1,253		1,041
Selling and marketing		1,438		1,081
General and administrative		1,691		1,919
Total	$	4,542	$	4,176

Performance-Based Vesting

Summary of RSU activity

		Weighted-Average
	Number of	Grant Date Fair
	Shares	Value
	(In thousands)
Balance at December 31, 2015	6	$	27.21
PVRSUs granted	—	$	—
PVRSUs vested	(6)	$	27.21
PVRSUs cancelled	—	$	—
Balance at March 31, 2016	—	$	—