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)

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Balance Sheet Components - Summary of Property Plant and Equipment and Rental Equipment with Associated Accumulated Depreciation (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Property Plant And Equipment [Line Items]    
Property and equipment $ 65,739 $ 67,215
Accumulated depreciation 44,788 42,016
Property and equipment, net 20,951 25,199
Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment 51,010 54,582
Accumulated depreciation 35,323 33,937
Property and equipment, net 15,687 20,645
Other property and equipment    
Property Plant And Equipment [Line Items]    
Property and equipment 14,729 12,633
Accumulated depreciation 9,465 8,079
Property and equipment, net $ 5,264 $ 4,554