Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of option activity

The following is a summary of option activity (in thousands, except per share data):

				Weighted				Weighted
		Weighted		Average				Average
		Average		Share Price		Weighted		Remaining	Aggregate
	Number of	Exercise		onDate of		Average		Contractual	Intrinsic
	shares	Price		Exercise		Fair Value		Life	Value
	(in thousands, except price data)
Outstanding, January 1, 2018	536	$	10.04			$	5.19		$	14,888
Exercised	(80)		9.74	$	32.95		4.90			1,847
Forfeited	(88)		9.93				5.10			3,083
Outstanding, June 30, 2018	368	$	10.13			$	5.27	5.12	$	12,802
Exercisable, June 30, 2018	368	$	10.13					5.12	$	12,802
Vested and expected to vest	368	$	10.13					5.12	$	12,802

Summary of RSU/RSA activity

The following is a summary of RSU/RSA activity (in thousands, except per share data):

		Weighted
		AverageShare		Weighted		Aggregate
	Number of	Price onDate		Average Fair		Intrinsic
	shares	ofRelease		Value		Value
	(in thousands, except price data)
Outstanding at January 1, 2018	707			$	29.23	$	26,732
Granted	517				33.77		17,444
Released	(166)	$	35.69		28.78		5,914
Cancelled/Forfeited	(25)				32.15		1,110
Outstanding, June 30, 2018	1,033			$	31.50	$	46,384
Exercisable, June 30, 2018	4					$	140
Vested and expected to vest	1,033					$	46,384

Schedule of employee stock-based compensation expenses

Employee share-based compensation expenses recognized for the periods indicated (in thousands):

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Share-based compensation - by expense type
Cost of goods sold	$	211	$	134	$	388	$	212
Research and development		676		441		1,252		706
Sales and marketing		260		169		488		249
General and administrative		1,752		1,516		3,340		2,600
Total share-based compensation expense	$	2,899	$	2,260	$	5,468	$	3,767

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Share-based compensation - by award type
Employee stock options	$	12	$	268	$	12	$	547
Restricted stock units		2,887		1,992		5,456		3,220
Total share-based compensation expense	$	2,899	$	2,260	$	5,468	$	3,767