Investments in Unconsolidated Joint Ventures - Balance sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
ASSETS
Real estate, net	$ 299,814	$ 279,204
Cash and cash equivalents	2,169	6,515	$ 5,371	$ 9,196
Restricted cash	7,626	9,554	$ 16,812	$ 9,474
Prepaid expenses and other assets, net	2,934	2,703
Intangible assets, net	8,802	9,172
Total assets	341,304	329,148
LIABILITIES
Accounts payable and accrued expenses	17,458	15,896
Total liabilities	284,480	261,240
STOCKHOLDERS' EQUITY
Accumulated deficit	(20,806)	(9,503)
Accumulated other comprehensive loss	(1,922)	(2,159)
Total liabilities and stockholders' equity	341,304	329,148
Our investments in unconsolidated joint ventures	18,318	19,379
Unconsolidated Joint Ventures
ASSETS
Real estate, net	165,806	167,749
Cash and cash equivalents	1,542	1,344
Restricted cash	851	766
Tenant and other receivables, net	187	254
Prepaid expenses and other assets, net	266	204
Intangible assets, net	22,692	24,006
Total assets	191,344	194,323
LIABILITIES
Mortgages payable, net	113,374	114,218
Accounts payable and accrued expenses	1,733	1,705
Total liabilities	115,107	115,923
STOCKHOLDERS' EQUITY
Members' equity	90,131	92,070
Accumulated deficit	(13,894)	(11,943)
Accumulated other comprehensive loss		(1,727)
Total members' equity	76,237	78,400
Total liabilities and stockholders' equity	191,344	194,323
Our investments in unconsolidated joint ventures	$ 18,318	$ 19,379