Quarterly report pursuant to Section 13 or 15(d)

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

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Balance Sheet Components - Summary of Depreciation and Amortization Expense of Rental Equipment and Other Property and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Property Plant And Equipment [Line Items]    
Depreciation $ 2,165 $ 2,689
Depreciation and amortization 2,695 3,177
Equipment    
Property Plant And Equipment [Line Items]    
Depreciation 2,165 2,689
Other property and equipment    
Property Plant And Equipment [Line Items]    
Depreciation and amortization $ 530 $ 488