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Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) Segment | Dec. 31, 2017 USD ($)
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |
Standard warranty period offered | 3 years |
Cash payments received in advance of satisfying distinct performance obligation | $ 3,300 |
Performance obligation partially offset of revenue recognized | $ 615 |
Rental revenue earned | 30-day period |
Number of operating segments | Segment | 1 |
Number of reportable segments | Segment | 1 |
Lifetime Warranties | Direct-to-Consumer |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |
Sales revenue | $ 13,505 | $ 10,820

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