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Balance sheet components - Inventory (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Components $ 3,301us-gaap_InventoryWorkInProcessAndRawMaterials $ 4,324us-gaap_InventoryWorkInProcessAndRawMaterials
Finished goods 160,743us-gaap_InventoryFinishedGoodsNetOfReserves 148,702us-gaap_InventoryFinishedGoodsNetOfReserves
Total inventory $ 164,044us-gaap_InventoryNet $ 153,026us-gaap_InventoryNet