Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Stock-Based Compensation

Summary of option activity

	Outstanding Options
	Number of	Weighted-Average
	Shares	Exercise Price
	(In thousands)
Balance at December 31, 2017	3,460	$	26.42
Options granted	599	$	33.21
Options exercised	(65)	$	17.66
Options forfeited	(77)	$	29.44
Options expired	—	$	—
Balance at March 31, 2018	3,917	$	27.54
Exercisable at March 31, 2018	2,493	$	26.02
Vested and expected to vest at March 31, 2018	3,799	$	27.44

Summary of RSU activity

		Weighted-Average
	Number of	Grant Date Fair
	Shares	Value
	(In thousands)
Balance at December 31, 2017	964	$	28.25
RSUs granted	503	$	33.34
RSUs vested	(383)	$	28.32
RSUs cancelled	(123)	$	30.12
Balance at March 31, 2018	961	$	30.64

Schedule of share-based compensation expense

	Three Months Ended
	March 31,
	2018		2017
	(In thousands)
Cost of product revenues	$	228	$	191
Research and development		1,263		1,389
Selling and marketing		1,287		1,511
General and administrative		2,408		2,014
Total	$	5,186	$	5,105