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Condensed consolidated financial statement details - Acquired Intangible Assets (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Finite-Lived Intangible Assets, Net [Abstract]      
Net carrying value $ 25,932    
Intangible assets, net 32,547   $ 2,937
Amortization of intangible assets 2,700 $ 800  
Goodwill 57,095   14,095
Series of Individually Immaterial Business Acquisitions [Member]      
Finite-Lived Intangible Assets, Net [Abstract]      
Gross carrying amount 32,951    
Accumulated amortization (7,019)    
Net carrying value 25,932   2,922
Indefinite lived intangible assets 6,615   15
Intangible assets, gross 39,566    
Intangible assets, net 32,547   $ 2,937
Goodwill $ 43,000