Financial Statement Details - Rental Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 26,773	$ 25,134
Less—accumulated depreciation	(16,017)	(18,436)
Property, plant and equipment, net	10,756	6,698
Rental Assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	18,176	16,648
Less—accumulated depreciation	(12,791)	(10,879)
Property, plant and equipment, net	$ 5,385	$ 5,769