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Balance Sheet Components - Schedule of Accrued Liabilities (Parenthetical) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Accrued Liabilities, Current [Abstract]
Accrued research and development services due to related party	$ 6.3	$ 0.0

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- Definition

Accrued research and development services due to related party.

+ References

No definition available.

+ Details

Name:	nmra_AccruedResearchAndDevelopmentServicesDueToRelatedParty
Namespace Prefix:	nmra_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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