RELATED-PARTY TRANSACTIONS - Fees and Expense Reimbursements (Details) - Affiliated Entity - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
CIM Service Provider, LLC | Series A Preferred Stock
Related Party Transaction [Line Items]
Related party, shares issued (in shares)		11,273
Asset management fees
Related Party Transaction [Line Items]
Related party, amount of transaction	$ 2,259	$ 2,363
Property management fees
Related Party Transaction [Line Items]
Related party, amount of transaction	403	427
Onsite management and other cost reimbursement
Related Party Transaction [Line Items]
Related party, amount of transaction	809	969
Lease commissions
Related Party Transaction [Line Items]
Related party, amount of transaction	15	40
Construction management fees
Related Party Transaction [Line Items]
Related party, amount of transaction	13	170
Base service fee
Related Party Transaction [Line Items]
Related party, amount of transaction	0	282
Expense reimbursements to related parties - corporate
Related Party Transaction [Line Items]
Related party, amount of transaction	605	812
Expenses reimbursement to related parties - lending segment
Related Party Transaction [Line Items]
Related party, amount of transaction	731	682
Upfront dealer manager and trailing dealer manager fees
Related Party Transaction [Line Items]
Related party, amount of transaction	150	241
Non-issuance specific offering costs
Related Party Transaction [Line Items]
Related party, amount of transaction	21	$ 24
Related party, deferred costs	$ 1,700		$ 1,500
Investment Management Agreement | CIM Capital, LLC | Series A Preferred Stock
Related Party Transaction [Line Items]
Related party, shares issued (in shares)		203,349