Business (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2023 USD ($) item	Sep. 30, 2023 USD ($) item	Oct. 31, 2023 USD ($)	Apr. 30, 2023 USD ($)	Apr. 27, 2023	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Number of additional residential condominium units closed or under contract | item	3	10
Number of residential condominium units closed or under contract to date | item	38	38
Total cash and restricted cash	$ 9,040,000	$ 9,040,000				$ 22,055,000	$ 11,672,000	$ 24,845,000
Cash and cash equivalents	809,000	809,000	$ 583,000,000			1,548,000	2,190,000	4,310,000
Restricted cash	8,231,000	$ 8,231,000				$ 20,507,000	$ 9,482,000	$ 20,535,000
Forbearance agreement period		30 days
Corporate Credit Facility
Forbearance agreement period		30 days
Interest rate (as a percent)					2.50%
Principal amount of debt deferred				$ 7,000,000.0
Amount of the debt to be prepaid by a specified date if strategic transaction is entered into				$ 5,000,000
Federal
Operating Loss Carryforwards	$ 305,400,000	$ 305,400,000