SHARE INCENTIVE PLANS (Tables)

9 Months Ended

Sep. 30, 2017

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

Summary of share option awards activity under equity incentive plans

Share option activity under the Company's equity incentive plans in the nine months ended September 30,2017 is set forth below:

	Options Outstanding
	Number of Shares		Weighted Average Exercise Price
Outstanding at December 31, 2016	1,634,485		$	32.79
Options exercised	(193,791	)	$	15.54
Options canceled	(32,355	)	$	70.53
Outstanding at September 30, 2017	1,408,339		$	34.30

Summary of restricted share units activity

RSU activity under the Company's equity incentive plans in the nine months ended September 30, 2017 is set forth below:

	Restricted Share Units Outstanding
	Number of Shares		Weighted Average Grant Date Fair Value
Non-vested restricted share units at December 31, 2016	3,324,519		$	46.67
Restricted share units granted	1,784,670		$	50.05
Restricted share units vested	(1,086,886	)	$	46.43
Restricted share units canceled	(296,321	)	$	47.52
Non-vested restricted share units at September 30, 2017	3,725,982		$	48.29

Summary of ordinary shares reserved for future issuance under equity incentive plans

The Company had the following ordinary shares reserved for future issuance under its equity incentive plans as of September 30, 2017:

	Number of Shares
Share options outstanding	1,408,339
Restricted share units outstanding	3,725,982
Shares authorized for future issuance	710,722
ESPP shares available for future issuance	3,425,469
Total shares reserved for future issuance as of September 30, 2017	9,270,512

Schedule of weighted average assumptions used to value share options granted

The following weighted average assumptions were used to value ESPP shares issued pursuant to the Company's share incentive plans for the nine months ended September 30, 2017 and 2016:

	Nine Months Ended September 30,
	2017		2016
Dividend yield	—	%	—	%
Expected volatility	24.6	%	36.4	%
Risk free interest rate	1.20	%	0.46	%
Expected life, years	0.5		0.5

Summary of the distribution of total share-based compensation expense

The following table summarizes the distribution of total share-based compensation expense in the unaudited condensed consolidated statements of operations:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
	(in thousands)
Cost of goods sold	$	473	$	627	$	1,530	$	1,773
Research and development	10,811		10,396		29,799		30,318
Sales and marketing	4,336		3,837		11,684		11,374
General and administrative	2,940		2,716		7,980		10,471
Total share-based compensation expense	$	18,560	$	17,576	$	50,993	$	53,936