Balance Sheet Components - Schedule of Accrued Liabilities (Parenthetical) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Accrued Liabilities, Current [Abstract]
Accrued research and development services due to related party	$ 0.0	$ 3.1

Accrued research and development services due to related party.

No definition available.

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