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Balance Sheet Components - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Feb. 28, 2018
Aug. 31, 2017
Property Plant And Equipment [Line Items]    
Total property, plant and equipment $ 59,687 $ 59,323
Less: Accumulated depreciation and amortization (51,736) (51,048)
Property, plant and equipment, net 7,951 8,275
Buildings and improvements    
Property Plant And Equipment [Line Items]    
Total property, plant and equipment 14,369 13,891
Machinery and equipment    
Property Plant And Equipment [Line Items]    
Total property, plant and equipment 42,361 42,562
Leasehold improvements    
Property Plant And Equipment [Line Items]    
Total property, plant and equipment 246 238
Other equipment    
Property Plant And Equipment [Line Items]    
Total property, plant and equipment 2,388 2,311
Construction in progress    
Property Plant And Equipment [Line Items]    
Total property, plant and equipment $ 323 $ 321