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Intangible Assets - Additional Information (Detail) - GBP (£) £ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Disclosure of detailed information about intangible assets [line items]
Amortisation charge recognised on intangible assets	£ 0.0	£ 0.0
MPH-966 [member]
Disclosure of detailed information about intangible assets [line items]
Change in fair value due to changes in timelines or probability	0.4
Other intangible assets [member]
Disclosure of detailed information about intangible assets [line items]
Revision in the value of any other intangible assets	£ 0.0	£ 0.0

X

- Definition

The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2021-01-01
-Paragraph 118
-Subparagraph e
-Clause vi
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_118_e_vi&doctype=Standard
-URIDate 2021-03-24

+ Details

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X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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X

- Definition

The increase (decrease) in intangible assets other than goodwill resulting from revaluations to fair value. [Refer: Intangible assets other than goodwill; Revaluation surplus]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2021-01-01
-Paragraph 118
-Subparagraph e
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_118_e_iii&doctype=Standard
-URIDate 2021-03-24

+ Details

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X

- Definition

Change in fair value due to changes in timelines or probability.

+ References

No definition available.

+ Details

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Namespace Prefix:	mreo_
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X

- Details

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- Details

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