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Balance Sheet Components - Summary of Intangible Assets (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Finite Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 6,296 | $ 6,338
Accumulated amortization | 2,203 | 1,621
Net amount | $ 4,093 | $ 4,717
Licenses |  |
Finite Lived Intangible Assets [Line Items] |  |
Average estimated useful lives (in years) | 10 years | 10 years
Gross carrying amount | $ 185 | $ 185
Accumulated amortization | 146 | 137
Net amount | $ 39 | $ 48
Patents And Websites |  |
Finite Lived Intangible Assets [Line Items] |  |
Average estimated useful lives (in years) | 5 years | 5 years
Gross carrying amount | $ 4,173 | $ 4,173
Accumulated amortization | 1,304 | 959
Net amount | $ 2,869 | $ 3,214
Customer Relationships |  |
Finite Lived Intangible Assets [Line Items] |  |
Average estimated useful lives (in years) | 4 years | 4 years
Gross carrying amount | $ 1,402 | $ 1,437
Accumulated amortization | 409 | 240
Net amount | $ 993 | $ 1,197
Non-Compete Agreement |  |
Finite Lived Intangible Assets [Line Items] |  |
Average estimated useful lives (in years) | 2 years 3 months 18 days | 3 years
Gross carrying amount | $ 233 | $ 240
Accumulated amortization | 91 | 52
Net amount | 142 | 188
Commercials |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 303 | 303
Accumulated amortization | 253 | 233
Net amount | $ 50 | $ 70
Commercials | Minimum |  |
Finite Lived Intangible Assets [Line Items] |  |
Average estimated useful lives (in years) | 2 years | 2 years
Commercials | Maximum |  |
Finite Lived Intangible Assets [Line Items] |  |
Average estimated useful lives (in years) | 3 years | 3 years

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