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Prepaid expenses and other current assets (Additional Information) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Standard amounts receivable	$ 1.6

X

- Definition

Amount Received

+ References

No definition available.

+ Details

Name:	mreo_AmountReceived
Namespace Prefix:	mreo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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

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