Segment Information - Revenues by Geographic Locations (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Segment Reporting Information [Line Items]
Total revenues	$ 69,585	$ 70,871	$ 60,752
UNITED STATES
Segment Reporting Information [Line Items]
Total revenues	58,393	67,750	56,211
SOUTH KOREA
Segment Reporting Information [Line Items]
Total revenues	8,161	2,059	2,686
ENGLAND
Segment Reporting Information [Line Items]
Total revenues	143	25	1,496
GERMANY
Segment Reporting Information [Line Items]
Total revenues	2,658	414	$ 359
SWITZERLAND
Segment Reporting Information [Line Items]
Total revenues	$ 230	$ 623