Revenue From Contract With Customer, Excluding Assessed Tax, Average Daily Rate

No definition available.

Name:	cmct_RevenueFromContractWithCustomerExcludingAssessedTaxAverageDailyRate
Namespace Prefix:	cmct_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Revenue From Contract With Customer, Excluding Assessed Tax, Occupancy Rate

+ References

No definition available.

+ Details

Name:	cmct_RevenueFromContractWithCustomerExcludingAssessedTaxHotelOccupancyRate
Namespace Prefix:	cmct_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Revenue From Contract With Customer, Excluding Assessed Tax, Revenue Per Available Room

+ References

No definition available.

+ Details

Name:	cmct_RevenueFromContractWithCustomerExcludingAssessedTaxRevenuePerAvailableRoom
Namespace Prefix:	cmct_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ConcentrationRiskLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13531-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

+ Details

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=cmct_HotelPropertiesSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

COVID-19 - Hotel Related Disclosures (Details) - USD ($)	1 Months Ended		3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019
Concentration Risk [Line Items]
Occupancy		86.30%	24.10%	12.50%		77.20%	81.70%
ADR		$ 162.39	$ 120.97	$ 124.49		$ 148.06	$ 173.08
RevPAR		$ 140.07	$ 29.16	$ 15.61		$ 114.33	$ 141.42
Hotel \| Revenues
Concentration Risk [Line Items]
Concentration risk, percent					22.00%
Subsequent Event
Concentration Risk [Line Items]
Occupancy	29.40%
ADR	$ 121.48
RevPAR	$ 35.67