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Consolidated financial statement details - Acquired Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
Goodwill | $ 57,095 | $ 14,095 |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Net carrying value | 24,412 |  |  |
Intangible assets, net | 31,027 | 2,937 |  |
Amortization of intangible assets | 4,200 | 1,100 | $ 1,100 |
Series of Individually Immaterial Business Acquisitions [Member] |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
Goodwill |  |  |  | $ 43,000
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Gross carrying value | 32,952 | 7,275 |  |
Accumulated amortization | (8,540) | (4,353) |  |
Net carrying value | 24,412 | 2,922 |  |
Indefinite lived intangible assets | 6,615 | 15 |  |
Intangible Assets, Gross (Excluding Goodwill) | 39,567 | 7,290 |  |
Intangible assets, net | $ 31,027 | $ 2,937 |  |

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