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Balance Sheet Components - Inventories (Details) - USD ($)
$ in Thousands
3 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Aug. 31, 2020
Disclosure Text Block Supplement [Abstract]      
Raw materials $ 383   $ 433
Work in process 936   792
Finished goods 1,446   1,251
Total 2,765   $ 2,476
Inventory write-downs $ 196 $ 119