Consolidated Balance Sheets - USD ($) $ in Thousands	Oct. 31, 2023	Oct. 31, 2022
Current assets:
Cash and cash equivalents	$ 915	$ 12,360
Short–term investments	22,929	17,327
Receivables	270	46
Prepaid expenses and other current assets	1,242	467
Total current assets	25,356	30,200
Operating lease right-of-use asset	166	212
Total assets	25,522	30,412
Current liabilities:
Accounts payable	206	265
Accrued expenses	1,770	1,726
Operating lease liability	52	46
Total current liabilities	2,028	2,037
Operating lease liability, non-current	123	175
Total liabilities	2,151	2,212
Equity:
Preferred stock, value
Common stock, par value $.01 per share; 100,000,000 shares authorized; 31,145,219 and 30,913,902 shares issued and outstanding as of October 31, 2023 and 2022, respectively	311	309
Additional paid-in capital	252,222	247,123
Accumulated deficit	(228,196)	(218,385)
Total shareholders’ equity	24,337	29,047
Noncontrolling interest (Note 2)	(966)	(847)
Total equity	23,371	28,200
Total liabilities and equity	25,522	30,412
Series A Convertible Preferred Stock [Member]
Equity:
Preferred stock, value