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

X
- Definition Represents the number of types of commercial real estate properties. + References No definition available. + Details
Name: | cmct_NumberOfTypesOfCommercialRealEstateProperties
Namespace Prefix: | cmct_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration