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
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount $ 1,232 $ 1,232
Accumulated amortization 1,026 1,003
Net amount $ 206 $ 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 104 100
Net amount $ 81 $ 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 787 779
Net amount $ 86 $ 94
Commercial    
Finite Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 2 years 2 years
Gross carrying amount $ 174 $ 174
Accumulated amortization 135 124
Net amount $ 39 $ 50