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, 2017
Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount $ 1,345 $ 1,345
Accumulated amortization 1,131 1,104
Net amount $ 214 $ 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 123 118
Net amount $ 62 $ 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 817 810
Net amount 56 63
Commercial    
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount 287 287
Accumulated amortization 191 176
Net amount $ 96 $ 111
Commercial | Minimum    
Finite Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 2 years 2 years
Commercial | Maximum    
Finite Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 3 years 3 years