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, 2016
Dec. 31, 2015
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount $ 1,344 $ 1,232
Accumulated amortization 1,076 1,003
Net amount $ 268 $ 229
Licenses    
Finite Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 10 years 10 years
Gross carrying amount $ 185 $ 185
Accumulated amortization 114 100
Net amount $ 71 $ 85
Patents And Websites    
Finite Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 5 years 5 years
Gross carrying amount $ 873 $ 873
Accumulated amortization 801 779
Net amount $ 72 $ 94
Commercial    
Finite Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 2 years 2 years
Gross carrying amount $ 286 $ 174
Accumulated amortization 161 124
Net amount $ 125 $ 50