Condensed Consolidated Statements of Operations (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2023	Jul. 31, 2022
Research and Development Expense [Member]
Stock-based payment arrangement, expense	$ 520	$ 771	$ 1,517	$ 3,014
General and Administrative Expense [Member]
Stock-based payment arrangement, expense	$ 697	$ 675	$ 1,990	$ 2,531