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Commitments and Contingencies, Licensing Agreements (Details)	12 Months Ended
	Dec. 31, 2023
Licensing Agreements [Abstract]
Notice period to assume control patents	30 days

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- References

No definition available.

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

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- Definition

The number of days to provide notice to assume control of such patents in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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No definition available.

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Name:	erna_NoticePeriodToAssumeControlPatents
Namespace Prefix:	erna_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration