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Financial Statement Details - Rental Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 25,134 $ 35,129
Less—accumulated depreciation (18,436) (28,138)
Property, plant and equipment, net 6,698 6,991
Rental Assets    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 16,648 16,602
Less—accumulated depreciation (10,879) (9,039)
Property, plant and equipment, net $ 5,769 $ 7,563