Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2016

Schedule of share-based compensation expense

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2016		2015		2016		2015
	(In thousands)				(In thousands)
Cost of product revenues	$	152	$	137	$	312	$	272
Research and development		1,269		1,113		2,522		2,153
Selling and marketing		1,437		1,192		2,875		2,274
General and administrative		1,989		1,509		3,680		3,428
Total	$	4,847	$	3,951	$	9,389	$	8,127

Stock Options

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	675	$	26.91
Options exercised	(235)	$	18.52
Options forfeited	(11)	$	29.94
Options expired	(41)	$	28.70
Balance at June 30, 2016	4,018	$	24.57
Exercisable at June 30, 2016	2,868	$	22.98
Vested and expected to vest at June 30, 2016	3,909	$	24.47

Stock Options | Performance-Based Vesting

Summary of option activity

	Outstanding PV Stock Options
	Number of	Weighted-Average
	Shares	Exercise Price
	(In thousands)
Balance at December 31, 2015	—	$	—
PV stock options granted	76	$	31.12
PV stock options exercised	—	$	—
PV stock options forfeited	—	$	—
PV stock options expired	—	$	—
Balance at June 30, 2016	76	$	31.12
Exercisable at June 30, 2016	—	$	—
Vested and expected to vest at June 30, 2016	71	$	31.12

RSUs

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	555	$	27.46
RSUs vested	(283)	$	30.24
RSUs cancelled	(40)	$	29.52
Balance at June 30, 2016	914	$	28.54

RSUs | 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	12	$	28.09
PVRSUs vested	(6)	$	27.21
PVRSUs cancelled	—	$	—
Balance at June 30, 2016	12	$	28.09