Balance Sheet Components - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Feb. 28, 2023	Aug. 31, 2022
Property Plant And Equipment [Line Items]
Total property, plant and equipment	$ 43,914	$ 43,872
Less: Accumulated depreciation and amortization	(40,284)	(39,733)
Property, plant and equipment, net	3,630	4,139
Buildings and improvements
Property Plant And Equipment [Line Items]
Total property, plant and equipment	13,685	13,698
Machinery and equipment
Property Plant And Equipment [Line Items]
Total property, plant and equipment	27,681	27,649
Leasehold improvements
Property Plant And Equipment [Line Items]
Total property, plant and equipment	161	161
Other equipment
Property Plant And Equipment [Line Items]
Total property, plant and equipment	2,281	2,283
Construction in progress
Property Plant And Equipment [Line Items]
Total property, plant and equipment	$ 106	$ 81