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Employee benefit plans (Tables)

12 Months Ended

Dec. 31, 2015

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 in 2015 and related information is as follows:

	Options outstanding
(shares in thousands)	Shares			Weighted- average exercise price				Weighted- average remaining contractual term (in years)		Aggregate intrinsic value (in thousands)
Outstanding at December 31, 2014:	25,134			$	6.62			7.09		$	1,425,339
Granted	792			39.66
Exercised	(12,375	)		2.01
Forfeited/Cancelled	(470	)		38.84
Outstanding at December 31, 2015:	13,081			$	11.82			6.70		$	108,846
Exercisable at December 31, 2015	8,449			$	6.19			5.89		$	103,696
Vested and expected to vest at December 31, 2015	12,858			$	11.62			6.67		$	108,681

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

A summary of the Company's RSA activity in 2015 is as follows:

	Shares (in thousands)			Weighted- average grant date fair value				Aggregate intrinsic value (in thousands)
Non-vested shares at December 31, 2014	17			$	6.30			$	1,017
Vested	(17)
Non-vested shares at December 31, 2015	—

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

A summary of the Company’s RSU activity in 2015 and 2014 is as follows:

(shares in thousands)	Shares			Weighted- average grant date fair value
Non-vested shares at December 31, 2013	270			$	1.52
Granted	5,573			22.01
Vested	(1,533	)		18.42
Forfeited	(3	)		57.73
Non-vested shares at December 31, 2014	4,307			$	21.98
Granted	2,170			44.00
Vested	(1,735	)		19.84
Forfeited	(104	)		63.47
Non-vested shares at December 31, 2015	4,638			$	32.15

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The fair value of stock options granted was estimated as of the grant date using the following assumptions:

	Year ended December 31,
	2015		2014		2013
Volatility	43%–54%		54%–56%		56%–60%
Expected term (years)	5.5–7.0		5.3–6.3		5.3–6.1
Risk-free interest rate	1.6%–2.0%		1.7%–2.0%		0.8%–2.4%
Dividend yield	—%		—%		—%

Schedule of Share-based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions [Table Text Block]

The fair value of stock purchase rights granted under the ESPP was estimated using the following assumptions:

	Year ended December 31,
	2015		2014
Volatility	39%–45%		45.5%
Expected term (years)	0.5		0.6
Risk-free interest rate	0.1%–0.2%		0.1%
Dividend yield	—%		—%

Allocation of Stock-based Compensation Expense

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

	Year ended December 31,
(in thousands)	2015				2014				2013
Cost of revenue	$	1,492			$	835			$	690
Research and development	18,024				11,640				3,003
Sales and marketing	13,762				10,428				5,670
General and administrative	47,402				48,496				1,524
Total stock-based compensation expense, before income taxes	80,680				71,399				10,887
Total tax benefit recognized	(27,971		)		(19,471		)		(1,104		)
Total stock-based compensation expense, net of income taxes	$	52,709			$	51,928			$	9,783

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Schedule of Share-based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions [Table Text Block]

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
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-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

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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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.

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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.

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-Name Accounting Standards Codification
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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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

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