Condensed consolidated financial statement details - Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying value			$ 48,634	$ 32,952
Accumulated amortization			(15,063)	(8,540)
Net carrying value			33,571	24,412
Indefinite lived intangible assets	$ 6,615		3,925	6,615
Intangible Assets, Gross (Excluding Goodwill)			52,559	39,567
Intangible assets, net			37,496	31,027
Indefinite-lived Intangible Assets [Roll Forward]
Balance at December 31, 2015	6,615
IPR&D assets acquired	3,760
Technological feasibility achieved	(450)
Asset impairment	(6,000)	$ 0
Balance at September 30, 2016	$ 3,925
Estimated useful life (in years)	4 years
Amortization of intangible assets	$ 6,500	$ 2,700
Goodwill			$ 146,459	$ 57,095

Indefinite-lived Intangible Assets, Technological Feasibility Achieved

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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.

+ References

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, from an acquisition.

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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