Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components - Summary of Property Plant and Equipment and Rental Equipment with Associated Accumulated Depreciation (Details)

v3.10.0.1
Balance Sheet Components - Summary of Property Plant and Equipment and Rental Equipment with Associated Accumulated Depreciation (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]    
Property and equipment $ 66,676 $ 64,568
Accumulated depreciation 43,661 44,465
Property and equipment, net 23,015 20,103
Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment 44,515 49,349
Accumulated depreciation 32,605 34,754
Property and equipment, net 11,910 14,595
Other property and equipment    
Property Plant And Equipment [Line Items]    
Property and equipment 22,161 15,219
Accumulated depreciation 11,056 9,711
Property and equipment, net $ 11,105 $ 5,508