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Financial Statement Details - Rental Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 35,129 $ 33,424
Less—accumulated depreciation (28,138) (25,032)
Property, plant and equipment, net 6,991 8,392
Rental Assets    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 16,602 11,115
Less—accumulated depreciation (9,039) (4,112)
Property, plant and equipment, net $ 7,563 $ 7,003