SHARE INCENTIVE PLANS: (Tables)

3 Months Ended

Mar. 31, 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 three months ended March 31,2017 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	(105,010	)	$	14.54
Options canceled	(6,960	)	$	59.28
Outstanding at March 31, 2017	1,522,515		$	33.93

Summary of restricted share units activity

RSU activity under the Company's equity incentive plans in the three months ended March 31, 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	101,760		$	44.83
Restricted share units vested	(239,568	)	$	44.55
Restricted share units canceled	(93,776	)	$	47.07
Non-vested restricted share units at March 31, 2017	3,092,935		$	46.76

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 March 31, 2017:

	Number of Shares
Share options outstanding	1,522,515
Restricted share units outstanding	3,092,935
Shares authorized for future issuance	525,692
ESPP shares available for future issuance	3,724,647
Total shares reserved for future issuance as of March 31, 2017	8,865,789

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 three months ended March 31, 2017 and 2016:

	Three Months Ended March 31,
	2017		2016
Dividend yield	—	%	—	%
Expected volatility	25.3	%	37.6	%
Risk free interest rate	0.91	%	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 March 31,
	2017		2016
	(in thousands)
Cost of goods sold	$	482	$	475
Research and development	8,690		9,152
Sales and marketing	3,338		3,648
General and administrative	2,258		4,991
Total share-based compensation expense	$	14,768	$	18,266