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

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- References No definition available. + Details
Name: | erna_LicensingAgreementsAbstract
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. + References No definition available. + Details
Name: | erna_NoticePeriodToAssumeControlPatents
Namespace Prefix: | erna_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration