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Financial Statement Details - Rental Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 33,424 $ 71,644
Less—accumulated depreciation (25,032) (62,832)
Property, plant and equipment, net 8,392 8,812
Rental Assets    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 11,115 7,189
Less—accumulated depreciation (4,112) (1,034)
Property, plant and equipment, net $ 7,003 $ 6,155