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Other Receivables and Prepaid Expenses (Schedule of Other Receivables and Prepaid Expenses) (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Prepaid Expense and Other Assets [Abstract]
Government institutions	$ 151	$ 263
Prepaid expenses	2,864	1,435
Receivable from sale of ADSs	44	0
Other Receivables and Prepaid Expenses, Total	$ 3,059	$ 1,698

X

- Definition

Represents the amount of receivable from sale of American Depositary Shares.

+ References

No definition available.

+ Details

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Namespace Prefix:	cmmb_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Government institutions.

+ References

No definition available.

+ Details

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Namespace Prefix:	cmmb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Definition

Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(9))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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

X

- Definition

Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483467/210-10-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 340
-SubTopic 10
-Name Accounting Standards Codification
-Section 05
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482955/340-10-05-5

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 340
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483032/340-10-45-1

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Period Type:	instant