Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components - Summary of Intangible Assets (Details)

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Balance Sheet Components - Summary of Intangible Assets (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount $ 6,635 $ 6,338
Accumulated amortization 2,532 1,621
Net amount $ 4,103 $ 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 151 137
Net amount $ 34 $ 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 1,476 959
Net amount $ 2,697 $ 3,214
Customer Relationships    
Finite Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 4 years 4 years
Gross carrying amount $ 1,392 $ 1,437
Accumulated amortization 493 240
Net amount $ 899 $ 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 $ 232 $ 240
Accumulated amortization 123 52
Net amount 109 188
Commercials    
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount 653 303
Accumulated amortization 289 233
Net amount $ 364 $ 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