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, 2017
Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount $ 3,014 $ 1,345
Accumulated amortization 1,364 1,104
Net amount $ 1,650 $ 241
Licenses    
Finite Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 10 years 10 years
Gross carrying amount $ 185 $ 185
Accumulated amortization 132 118
Net amount $ 53 $ 67
Patents And Websites    
Finite Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 5 years 5 years
Gross carrying amount $ 873 $ 873
Accumulated amortization 832 810
Net amount $ 41 63
Customer Relationships    
Finite Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 4 years  
Gross carrying amount $ 1,417  
Accumulated amortization 147  
Net amount $ 1,270  
Non-Compete Agreement    
Finite Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 3 years  
Gross carrying amount $ 236  
Accumulated amortization 33  
Net amount 203  
Commercials    
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount 303 287
Accumulated amortization 220 176
Net amount $ 83 $ 111
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