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Balance Sheet Components - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Nov. 30, 2020
Aug. 31, 2020
Property Plant And Equipment [Line Items]    
Total property, plant and equipment $ 51,616 $ 50,638
Less: Accumulated depreciation and amortization (45,995) (44,993)
Property, plant and equipment, net 5,621 5,645
Buildings and improvements    
Property Plant And Equipment [Line Items]    
Total property, plant and equipment 14,441 14,104
Machinery and equipment    
Property Plant And Equipment [Line Items]    
Total property, plant and equipment 34,520 33,977
Leasehold improvements    
Property Plant And Equipment [Line Items]    
Total property, plant and equipment 170 166
Other equipment    
Property Plant And Equipment [Line Items]    
Total property, plant and equipment 2,476 2,384
Construction in progress    
Property Plant And Equipment [Line Items]    
Total property, plant and equipment $ 9 $ 7