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
Mar. 31, 2017
Mar. 31, 2016
Property Plant And Equipment [Line Items]    
Depreciation $ 2,689 $ 2,947
Depreciation and amortization 3,177 3,425
Equipment    
Property Plant And Equipment [Line Items]    
Depreciation 2,689 2,947
Other property and equipment    
Property Plant And Equipment [Line Items]    
Depreciation and amortization $ 488 $ 478