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Condensed consolidated financial statement details - Business Acquisition (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill	$ 57,095	$ 14,095
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	70,200
Net liabilities assumed	(353)
Deferred income tax liabilities	(4,676)
Net assets acquired	27,247
Goodwill	43,000
Total fair value consideration	70,247
Developed Technology Rights [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Purchased technology	$ 25,676
Developed Technology Rights [Member] | Maximum [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Estimated useful life (in years)	6 years
Developed Technology Rights [Member] | Minimum [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Estimated useful life (in years)	4 years
In Process Research and Development [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
In-process research and development (IPR&D)	$ 6,600

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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