Summary of Significant Accounting Policies - Real Estate Properties (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Summary of Significant Accounting Policies
Land	$ 6,338	$ 313
Building	7,530	1,019
Lease intangibles - asset	1,895	132
Lease intangibles - (liability)	(1,168)	(285)
Real Estate Held-for-sale, gross	14,595	1,179
Accumulated depreciation and amortization, net	(1,046)	20
Total Real Estate Held for Sale, net	$ 13,549	$ 1,199