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Summary of Significant Accounting Policies - Basis of Presentation and Use of Estimates (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Feb. 28, 2018
Feb. 28, 2017
Aug. 31, 2017
Aug. 31, 2016
Accounting Policies [Abstract]            
Losses from operations $ 1,239 $ 1,129 $ 2,104 $ 2,232 $ 4,300 $ 20,600
Gross profits (losses) on product sales (444) 7 (392) 123 82 (4,900)
Net cash provided by (used in) operating activities     162 (1,759) (2,100) (3,400)
Cash and cash equivalents $ 3,857 $ 4,068 $ 3,857 $ 4,068 $ 3,582 $ 6,030