RELATED-PARTY TRANSACTIONS - Fees and Expense Reimbursements (Details) - Affiliated Entity - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 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	$ 2,262	$ 2,387	$ 6,781	$ 7,126
Property management fees
Related Party Transaction [Line Items]
Related party, amount of transaction	416	461	1,223	1,258
Onsite management and other cost reimbursement
Related Party Transaction [Line Items]
Related party, amount of transaction	385	867	1,949	2,451
Leasing commissions
Related Party Transaction [Line Items]
Related party, amount of transaction	59	18	107	101
Construction management fees
Related Party Transaction [Line Items]
Related party, amount of transaction	70	32	105	309
Base service fee
Related Party Transaction [Line Items]
Related party, amount of transaction	0	0	0	282
Expense reimbursements to related parties - corporate
Related Party Transaction [Line Items]
Related party, amount of transaction	533	639	1,592	2,066
Expense reimbursements to related parties - lending segment
Related Party Transaction [Line Items]
Related party, amount of transaction	55	901	1,219	2,581
Upfront dealer manager and trailing dealer manager fees
Related Party Transaction [Line Items]
Related party, amount of transaction	145	313	567	902
Non-issuance specific offering costs
Related Party Transaction [Line Items]
Related party, amount of transaction	13	$ 27	77	$ 72
Related party, deferred costs	$ 2,000		$ 2,000		$ 1,500
Investment Management Agreement | CIM Capital, LLC | Common Stock
Related Party Transaction [Line Items]
Related party, shares issued (in shares)				203,349
Investment Management Agreement | CIM Capital, LLC | Series A Preferred Stock
Related Party Transaction [Line Items]
Related party, shares issued (in shares)			89,338	190,459