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Finance income, finance costs and changes in the fair value of financial instruments - Summary of Finance income (Detail) - GBP (£) £ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Disclosure Of Finance Income Explanatory [Line Items]
Interest income on short-term deposits	£ 173	£ 1
Total	£ 173	£ 1

X

- Definition

The amount of income associated with interest and other financing activities of the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 85
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_85&doctype=Standard
-URIDate 2021-03-24

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Disclosure Of Finance Income Explanatory.

+ References

No definition available.

+ Details

Name:	mreo_DisclosureOfFinanceIncomeExplanatoryLineItems
Namespace Prefix:	mreo_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Interest income on short-term deposits.

+ References

No definition available.

+ Details

Name:	mreo_InterestIncomeOnShortTermDeposits
Namespace Prefix:	mreo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration