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Balance Sheet Components - Intangible Assets (Details)
$ in Thousands
 6 Months Ended 12 Months Ended
Oct. 25, 2017
USD ($)
Patent
Feb. 28, 2018
USD ($)
Aug. 31, 2017
USD ($)
Finite Lived Intangible Assets [Line Items]      
Gross Carrying Amount   $ 1,090 $ 1,077
Accumulated Amortization   981 973
Net Carrying Amount   109 $ 104
Number of patents sold | Patent 4    
Proceeds from sale of intangible assets   $ 1  
Patents and trademarks      
Finite Lived Intangible Assets [Line Items]      
Weighted Average Amortization Period (Years)   15 years 15 years
Gross Carrying Amount   $ 570 $ 574
Accumulated Amortization   461 470
Net Carrying Amount   $ 109 $ 104
Acquired technology      
Finite Lived Intangible Assets [Line Items]      
Weighted Average Amortization Period (Years)   5 years 5 years
Gross Carrying Amount   $ 520 $ 503
Accumulated Amortization   $ 520 $ 503
Patents      
Finite Lived Intangible Assets [Line Items]      
Proceeds from sale of intangible assets $ 500