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Subsequent Events (Narrative) (Details)	Jan. 13, 2023 USD ($)
Subsequent event [Member]
Subsequent Event [Line Items]
Issuance and sale of of ADS upto	$ 20,000,000

X

- Definition

Represents the amount of sale of stock value of shares issued in transaction.

+ References

No definition available.

+ Details

Name:	cmmb_SaleOfStockValueOfSharesIssuedInTransaction
Namespace Prefix:	cmmb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: