Condensed Consolidated Statements of Operations (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2023	Apr. 30, 2022
Research and Development Expense [Member]
Stock-based payment arrangement, expense	$ 492	$ 966	$ 998	$ 2,243
General and Administrative Expense [Member]
Stock-based payment arrangement, expense	$ 735	$ 779	$ 1,292	$ 1,856