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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Property Plant And Equipment [Line Items]        
Depreciation $ 1,689 $ 2,366 $ 5,820 $ 7,577
Depreciation and amortization 2,380 2,835 7,592 9,004
Equipment | Service        
Property Plant And Equipment [Line Items]        
Depreciation 1,689 2,366 5,820 7,577
Other property and equipment        
Property Plant And Equipment [Line Items]        
Depreciation and amortization $ 691 $ 469 $ 1,772 $ 1,427