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Commitments and Contingencies, Legal Matters (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)
Legal Matters [Abstract]
Aggregate settlement amount payable	$ 0.5
Litigation settlement, amount	$ 1.2

X

- References

No definition available.

+ Details

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

X

- Definition

Amount payable to other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

Name:	erna_LitigationSettlementAmountPayable
Namespace Prefix:	erna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementAmountAwardedToOtherParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration