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Subsequent events (Detail Textuals) - Subsequent Event [Member] - Private Placement [Member] $ / shares in Units, $ in Millions	1 Months Ended
	Jul. 25, 2024 USD ($) $ / shares shares
Subsequent Event [Line Items]
Proceeds from sale of ADS | $	$ 10.0
ADS and pre-funded warrants sold to the Purchasers	4,148,867
ADS issued against pre-funded warrants	3,948,300
ADS, exercise price | $ / shares	$ 0.0001

X

- Definition

Represents the number Of american depository shares and pre funded warrants issued

+ References

No definition available.

+ Details

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Namespace Prefix:	cmmb_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the amount of proceeds from sale of american depositary shares.

+ References

No definition available.

+ Details

Name:	cmmb_ProceedsFromSaleOfAmericanDepositaryShares
Namespace Prefix:	cmmb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the number of new american depository shares issued.

+ References

No definition available.

+ Details

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Namespace Prefix:	cmmb_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

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

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481674/830-30-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483399/855-10-50-2

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: