Real Estate Assets, Net - Narrative (Details)	3 Months Ended			12 Months Ended
	Mar. 31, 2024 USD ($) property		Mar. 31, 2023 USD ($) property	Dec. 31, 2023 USD ($) property		Dec. 31, 2022 USD ($)
Real Estate [Line Items]
Net investments in real estate	$ 5,191,000	[1]	$ 5,092,000	$ 3,785,000	[1]	$ 6,333,000
Property held-for-sale	$ 0			$ 200,000
Number of properties owned | property	24			20
Disposals | property	(2)		(5)
Gain (loss) on sale of property	$ 8,000		$ 91,000
Real estate impairment (recovery)	(400,000)		(100,000)
Other income
Real Estate [Line Items]
Gain (loss) on sale of property	$ 8,000		$ 100,000

[1] Real estate owned properties, net, are presented net of valuation allowances of $1.6 million and $1.2 million at March 31, 2024 and December 31, 2023, respectively.