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

For the disposal group, amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year.

No definition available.

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

For the disposal group, amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year.

No definition available.

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

For the disposal group, amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year.

No definition available.

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

For the disposal group, amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year.

No definition available.

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

For the disposal group, amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year.

No definition available.

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

For the disposal group, amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year.

No definition available.