Summary of Significant Accounting Policies - Basis of Presentation and Use of Estimates (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2021	May 31, 2020	Aug. 31, 2020	Aug. 31, 2019
Accounting Policies [Abstract]
Losses from operations	$ 592	$ 741	$ 2,071	$ 1,692	$ 2,100	$ 3,700
Gross profits (losses) on product sales	664	$ 416	883	1,482	1,600	452
Net cash used in operating activities			826	$ 786	1,000	$ 3,500
Cash and cash equivalents	$ 1,666		$ 1,666		$ 2,832