INVESTMENT IN REAL ESTATE LOANS - Schedule of Investment in Real Estate Loans, net (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investment in real estate loans, net	$ 23,168	$ 23,689
Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real estate loans	28,150	28,671
Allowance for credit losses	(4,982)	(4,982)
Investment in real estate loans, net	$ 23,168	$ 23,689

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant