Investments in Unconsolidated Joint Ventures - Balance sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Real estate, net	$ 66,016	$ 66,705	$ 67,334	$ 67,996	$ 68,663	$ 69,353	$ 70,040
Cash and cash equivalents	3,112	1,381	4,310	917	2,169	5,034	6,515	$ 9,196
Restricted cash	13,279	14,232	20,535	11,732	7,626	6,694	9,554	$ 9,474
Prepaid expenses and other assets, net	4,915	5,007	4,126	3,555	2,934	3,343	2,703
Intangible assets, net	8,062	8,247	8,432	8,617	8,802	8,987	9,172
Total assets	316,089	330,082	341,170	340,538	332,866	327,947	323,260
LIABILITIES
Accounts payable and accrued expenses	22,824	19,876	17,864	18,457	17,458	14,368	15,896
Total liabilities	271,192	285,209	291,163	295,297	284,480	273,424	261,240
STOCKHOLDERS' EQUITY
Accumulated deficit	(41,550)	(41,327)	(36,196)	(32,852)	(29,244)	(22,810)	(15,391)
Accumulated other comprehensive loss	(1,106)	(1,224)	(1,343)	(1,803)	(1,922)	(2,040)	(2,159)
Total liabilities and stockholders' equity	316,089	330,082	341,170	340,538	332,866	327,947	323,260
Our investments in unconsolidated joint ventures	4,643	$ 18,517	17,938	$ 18,056	$ 18,318	$ 18,814	$ 19,379
Unconsolidated Joint Ventures
ASSETS
Real estate, net	114,874		164,143
Cash and cash equivalents	1,370		1,244
Restricted cash	670		891
Tenant and other receivables, net	224		225
Prepaid expenses and other assets, net	1,032		315
Intangible assets, net	9,945		21,527
Total assets	128,115		188,345
LIABILITIES
Mortgages payable, net	80,401		112,934
Accounts payable and accrued expenses	1,420		1,849
Total liabilities	81,821		114,783
STOCKHOLDERS' EQUITY
Members' equity	49,777		87,654
Accumulated deficit	(3,483)		(14,092)
Total members' equity	46,294		73,562
Total liabilities and stockholders' equity	$ 128,115		$ 188,345