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Subsequent Events - Additional Information (Details) - Alkermes - USD ($) $ in Millions	Nov. 15, 2023	Nov. 14, 2023
Subsequent Event [Line Items]
Distribution term of shares	one ordinary share of the Company for every ten ordinary shares
Effective time of distribution		Nov. 15, 2023
Cash distribution received from parent		$ 275.0

X

- Definition

Distribution made to limited liability company distribution term of shares.

+ References

No definition available.

+ Details

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Namespace Prefix:	mura_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Proceeds from cash distributions from parent.

+ References

No definition available.

+ Details

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Namespace Prefix:	mura_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Date of distribution for distribution of cash or unit to member of limited liability company (LLC), in YYYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

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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- Details

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Namespace Prefix:
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Period Type: