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 | ||
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Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2018 |
Sep. 30, 2017 |
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| 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 |
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- Definition Amount of expense for allocation of cost of tangible asset over its useful life directly used in production of good and rendering of service. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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