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Income Taxes (Schedule of Roll Forward of Valuation Allowance) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Balance at January 1	$ 43,471	$ 41,195	$ 36,030
Currency transaction income (loss)	(2,459)	(3,295)	(1,316)
Income tax expense	3,207	5,571	6,481
Balance at December 31	$ 44,219	$ 43,471	$ 41,195

X

- Definition

Amount of increase (decrease) in the valuation allowance due to currency transaction loss.

+ References

No definition available.

+ Details

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Namespace Prefix:	cmmb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of increase (decrease) in the valuation allowance due to income tax expense.

+ References

No definition available.

+ Details

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Namespace Prefix:	cmmb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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