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General. - Merger (Details) - Securities Purchase Agreements for the offering and sale by Anchiano [Member] $ / shares in Units, $ in Millions	Mar. 15, 2021 USD ($) $ / shares
Restructuring Cost and Reserve [Line Items]
Isuuance and sale value of ADSs and warrants	$ 45.5
Warrant exercise price | $ / shares	$ 17.35
Warrants exercisable period	5 years
Proceeds from exercise of warrants	$ 4.5

X

- Definition

Represent the warrants exercisable period.

+ References

No definition available.

+ Details

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Namespace Prefix:	CMMB_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The cash inflow associated with the amount received from holders exercising their stock warrants.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- 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

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Balance Type:	na
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X

- Definition

Value of preferred stock and warrants for common stock issued.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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X

- Details

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Namespace Prefix:
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