SEGMENT DISCLOSURE - Narrative (Details) - property	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Segment Reporting [Abstract]
Number of types of commercial real estate properties	2	2

Represents the number of types of commercial real estate properties.

No definition available.

Name:	cmct_NumberOfTypesOfCommercialRealEstateProperties
Namespace Prefix:	cmct_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration