Name:	cmct_DisposalGroupIncludingDiscontinuedOperationDebt
Namespace Prefix:	cmct_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

Name:	cmct_DisposalGroupIncludingDiscontinuedOperationDebtAbstract
Namespace Prefix:	cmct_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

For the disposal group, the amount of debt premium that was originally recognized at acquisition of the instrument that has yet to be amortized.

No definition available.

Name:	cmct_DisposalGroupIncludingDiscontinuedOperationDebtInstrumentUnamortizedDiscountPremiumNet
Namespace Prefix:	cmct_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

For the disposal group, amount of long-term debt before adjustment for unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

No definition available.

Name:	cmct_DisposalGroupIncludingDiscontinuedOperationLongTermDebtGross
Namespace Prefix:	cmct_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Percentage of Loan

No definition available.

Name:	cmct_PercentageOfLoan
Namespace Prefix:	cmct_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Weighted average interest rate of debt outstanding.

No definition available.

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Name:	us-gaap_LongtermDebtTypeAxis=cmct_SecuredBorrowingsGovernmentGuaranteedLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_LongtermDebtTypeAxis=cmct_LoansSoldForPremiumAndExcessSpreadMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_LongtermDebtTypeAxis=cmct_LoansSoldForExcessSpreadMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_LongtermDebtTypeAxis=cmct_CommercialRealEstateLoanWithVariableRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: