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Condensed Interim Statements of Cash flows (Unaudited) (Parenthetical) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Supplemental disclosure of non-cash investing and financing activities:
Liabilities assumed, net of non-cash assets received in reverse merger	$ 49
Accrued share issuance expenses	$ 63

X

- Definition

The amount of accrued issuance expenses non-cash investing and financing activities.

+ References

No definition available.

+ Details

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Namespace Prefix:	CMMB_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of liabilities assumed, net of non-cash assets received in reverse merger.

+ References

No definition available.

+ Details

Name:	CMMB_LiabilitiesAssumedNetOfNonCashAssetsReceivedInReverseMerger
Namespace Prefix:	CMMB_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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