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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Property Plant And Equipment [Line Items]        
Depreciation $ 2,522 $ 2,908 $ 5,211 $ 5,855
Depreciation and amortization 2,992 3,404 6,169 6,829
Equipment        
Property Plant And Equipment [Line Items]        
Depreciation 2,522 2,908 5,211 5,855
Other property and equipment        
Property Plant And Equipment [Line Items]        
Depreciation and amortization $ 470 $ 496 $ 958 $ 974