Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components - Summary of Depreciation and Amortization Expense of Property and Equipment and Rental Equipment (Details)

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Balance Sheet Components - Summary of Depreciation and Amortization Expense of Property and Equipment and Rental Equipment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Property Plant And Equipment [Line Items]        
Depreciation $ 2,366 $ 2,878 $ 7,577 $ 8,733
Depreciation and amortization 2,835 3,388 9,004 10,217
Equipment        
Property Plant And Equipment [Line Items]        
Depreciation 2,366 2,878 7,577 8,733
Other property and equipment        
Property Plant And Equipment [Line Items]        
Depreciation and amortization $ 469 $ 510 $ 1,427 $ 1,484