Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components - Summary of Intangible Assets (Details)

v3.8.0.1
Balance Sheet Components - Summary of Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount $ 6,386 $ 6,338
Accumulated amortization 1,930 1,621
Net amount $ 4,456 $ 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 142 137
Net amount $ 43 $ 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 1,131 959
Net amount $ 3,042 $ 3,214
Customer Relationships    
Finite Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 4 years 4 years
Gross carrying amount $ 1,479 $ 1,437
Accumulated amortization 339 240
Net amount $ 1,140 $ 1,197
Non-Compete Agreement    
Finite Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 3 years 3 years
Gross carrying amount $ 246 $ 240
Accumulated amortization 75 52
Net amount 171 188
Commercials    
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount 303 303
Accumulated amortization 243 233
Net amount $ 60 $ 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