Liabilities, Other - Summary of Liabilities, Other (Detail) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Other Liabilities Disclosure [Abstract]
Accrued professional fees	$ 147,000	$ 155,000
Deposits and prepaid rent	180,000	93,000
Accrued payroll and related costs	35,000	75,000
Other	44,000	43,000
Liabilities, other	$ 406,000	$ 366,000