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Balance Sheet Components - Schedule of Accrued Liabilities (Parenthetical) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Accrued Liabilities, Current [Abstract] |  |
Accrued research and development services due to related party | $ 6.3 | $ 3.1

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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