M. SHARE-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2017

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

Summary of option activity

The following is a summary of option activity (shares and intrinsic values in thousands):

				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
Outstanding, January 1, 2015	1,423	$	8.96				4.48		$	3,486
Exercised	(81)		7.09	$	16.53		2.62			762
Forfeited	(32)		8.96				4.43			212
Outstanding, December 31, 2015	1,310		9.07				4.59			10,598
Exercised	(159)		6.91	$	19.90		2.56			2,071
Forfeited	(21)		7.96				3.29			273
Outstanding, December 31, 2016	1,130		9.40				4.90			15,872
Exercised	(418)		8.56	$	59.31		4.51			21,224
Forfeited	(176)		9.42				4.97			4,998
Outstanding, December 31, 2017	536	$	10.04			$	5.19	5.62	$	14,888
Exercisable, December 31, 2017	525	$	9.96					5.61	$	12,499
Vested and expected to vest	536	$	10.04					5.62	$	14,888

Summary of RSU/RSA activity

The following is a summary of RSU/RSA activity (shares and intrinsic values in thousands):

		Weighted
		AverageShare		Weighted		Aggregate
	Number of	Price onDate		Average Fair		Intrinsic
	shares	ofRelease		Value		Value
Outstanding at January 1, 2015	21				18.22		238
Granted	156	$	13.62		11.06		1,722
Released	(19)				18.24		257
Cancelled/Forfeited	(6)				10.00		99
Outstanding, December 31, 2015	152				11.20		2,611
Granted	497	$	13.50		15.73		7,815
Released	(122)				14.09		1,644
Cancelled/Forfeited	(10)				15.38		180
Outstanding, December 31, 2016	517				14.79		12,128
Granted	510				38.87		19,803
Released	(289)	$	60.87		20.92		17,579
Cancelled/Forfeited	(31)				24.23		1,181
Outstanding, December 31, 2017	707			$	29.23	$	26,732
Exercisable, December 31, 2017	4					$	140
Vested and expected to vest	703					$	26,592

Schedule of employee stock-based compensation expenses

Employee share-based compensation expenses recognized for the years ended December 31, were as follows (in thousands):

Share-Based compensation - by expense type:

	2017		2016		2015
Cost of goods sold	$	461	$	190	$	70
Research and development		1,496		591		230
Sales and marketing		481		357		217
General and administrative		5,357		2,695		1,603
Total share-based compensation expense	$	7,795	$	3,833	$	2,120

Share-Based compensation - by award type:

	2017		2016		2015
Employee stock options	$	853	$	1,460	$	1,538
Restricted stock units		6,942		2,373		582
Total share-based compensation expense	$	7,795	$	3,833	$	2,120