Consolidated Statements of Other Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2022	May 31, 2021
Statement Of Other Comprehensive Income [Abstract]
Net loss	$ (5,764)	$ (357)	$ (5,951)	$ (11,372)
Other comprehensive loss:
Unrealized gains on available-for-sale securities	169	85	105	79
Total other comprehensive income	169	85	105	79
Comprehensive loss	$ (5,595)	$ (272)	$ (5,846)	$ (11,293)