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Organization (Details) $ / shares in Units, $ in Thousands		6 Months Ended
	Aug. 05, 2021 $ / shares	Jun. 30, 2021 USD ($) ft² property joint_venture $ / shares	Jun. 30, 2020 ft² property joint_venture	Aug. 06, 2021 $ / shares	Dec. 31, 2020 USD ($) $ / shares
Entity Information [Line Items]
Number of joint ventures | joint_venture		1	1
Deferred rental payments		$ 3,752
Proceeds from rents received		3,507
Deferred rental payments receivable		$ 182			$ 5,791
Common stock, par value (in dollars per share) | $ / shares		$ 0.001			$ 0.001
Subsequent Event
Entity Information [Line Items]
Reverse stock split ratio	0.1
Common stock, par value (in dollars per share) | $ / shares	$ 0.01			$ 0.001
Unconsolidated Retail Properties at 100%
Entity Information [Line Items]
Number of managed retail properties | property		10	10
Gross leasable area (square feet) | ft²		2,470,000	2,470,000
Wholly-Owned Retail Properties
Entity Information [Line Items]
Number of retail properties | property		55	55
Gross leasable area (square feet) | ft²		8,395,000	8,329,000

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