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Employee benefit plans (Tables)

9 Months Ended

Sep. 30, 2016

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

Schedule of Share-based Compensation, Stock Options, Activity

A summary of the Company’s stock option activity for the nine months ended September 30, 2016 is as follows:

	Options outstanding
	Shares (in thousands)			Weighted- average exercise price				Weighted- average remaining contractual term (in years)		Aggregate intrinsic value (in thousands)
Outstanding at December 31, 2015:	13,081			$	11.82			6.70		$	108,846
Granted	2,516			11.33
Exercised	(1,442	)		1.53
Forfeited/Cancelled	(1,115	)		19.61
Outstanding at September 30, 2016:	13,040			$	12.20			6.41		$	86,550
Vested and expected to vest at September 30, 2016	12,803			$	12.12			6.37		$	85,781
Exercisable at September 30, 2016	8,132			$	9.28			5.51		$	73,387

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

A summary of the Company’s RSU activity for the nine months ended September 30, 2016 is as follows:

	Shares (in thousands)			Weighted- average grant date fair value
Non-vested shares at December 31, 2015	4,638			$	32.15
Granted	6,912			12.15
Vested	(1,229	)		26.23
Forfeited	(1,031	)		26.10
Non-vested shares at September 30, 2016	9,290			$	18.73

Allocation of Stock-based Compensation Expense

The following table summarizes stock-based compensation included in the condensed consolidated statements of operations:

	Three months ended								Nine months ended
(in thousands)	September 30, 2016				September 30, 2015				September 30, 2016				September 30, 2015
Cost of revenue	$	426			$	410			$	1,195			$	1,043
Research and development	8,039				4,872				21,135				12,117
Sales and marketing	3,816				3,516				10,699				9,514
General and administrative	6,185				9,072				18,572				39,886
Total stock-based compensation expense, before income taxes	18,466				17,870				51,601				62,560
Total tax benefit recognized	(5,573		)		(7,323		)		(15,723		)		(22,867		)
Total stock-based compensation expense, net of income taxes	$	12,893			$	10,547			$	35,878			$	39,693

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- References

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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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- Definition

Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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