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Summary of Significant Accounting Policies (Schedule of Annual rates of Depreciation) (Details)	12 Months Ended
	Dec. 31, 2021
Computers [Member]
Property, Plant and Equipment [Line Items]
Annual rates of depreciation	33.00%
Laboratory Equipment [Member]
Property, Plant and Equipment [Line Items]
Annual rates of depreciation	10.00%
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Annual rates of depreciation	7.00%
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Annual rates of depreciation	over the shorter of the lease term or the estimated useful life of the improvement

X

- Definition

Annual rates of depreciation.

+ References

No definition available.

+ Details

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Namespace Prefix:	cmmb_
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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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X

- Definition

Stated as a percentage, the estimated or actual value of the asset at the end of its useful life or when it is no longer serviceable (cannot be used for its original purpose) divided by its [historical] capitalized cost.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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