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Balance Sheet Components - Inventories (Details) - USD ($)
$ in Thousands
3 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Aug. 31, 2016
Balance Sheet Components      
Raw materials $ 1,364   $ 1,400
Work in process 567   700
Finished goods 1,846   1,967
Total 3,777   $ 4,067
Inventory write-downs $ 196 $ 452