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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Property Plant And Equipment [Line Items]        
Depreciation $ 2,908 $ 2,944 $ 5,855 $ 5,900
Depreciation and amortization 3,404 3,442 6,829 6,865
Equipment        
Property Plant And Equipment [Line Items]        
Depreciation 2,908 2,944 5,855 5,900
Other property and equipment        
Property Plant And Equipment [Line Items]        
Depreciation and amortization $ 496 $ 498 $ 974 $ 965