Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components - Summary of Changes in Net Carrying Values of Intangible Assets (Details)

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Balance Sheet Components - Summary of Changes in Net Carrying Values of Intangible Assets (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount $ 6,605 $ 6,584
Accumulated amortization 3,478 2,829
Net amount $ 3,127 $ 3,755
Licenses    
Finite Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 10 years 10 years
Gross carrying amount $ 185 $ 185
Accumulated amortization 160 155
Net amount $ 25 $ 30
Patents And Websites    
Finite Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 5 years 5 years
Gross carrying amount $ 4,164 $ 4,164
Accumulated amortization 1,974 1,640
Net amount $ 2,190 $ 2,524
Customer Relationships    
Finite Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 4 years 4 years
Gross carrying amount $ 1,364 $ 1,373
Accumulated amortization 739 572
Net amount $ 625 $ 801
Non-Compete Agreement    
Finite Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 2 years 3 months 18 days 2 years 3 months 18 days
Gross carrying amount $ 228 $ 229
Accumulated amortization 217 154
Net amount 11 75
Commercials    
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount 664 633
Accumulated amortization 388 308
Net amount $ 276 $ 325
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