XML 84 R60.htm IDEA: XBRL DOCUMENT
v3.23.1

Commitments and Contingencies, Licensing Agreements (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2022 | Dec. 31, 2022
Exclusive Factor License Agreement [Member] |  |
Licensing Agreements [Abstract] |  |
License agreement term |  | 5 years
License agreement extension term |  | 2 years 6 months
Threshold income for automatic extension of license period | $ 100 |
Percentage of sublicense fee payable by company before expiration date | 20.00% |
Percentage of sublicense fee payable by company during renewal term | 30.00% |
University of South Florida [Member] |  |
Licensing Agreements [Abstract] |  |
Percentage of royalty payable |  | 7.00%

X
- Definition The term of license agreement to be extendable, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | erna_LicenseAgreementExtensionTerm
Namespace Prefix: | erna_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition License agreement term in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | erna_LicenseAgreementTerm
Namespace Prefix: | erna_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Percentage of royalty payable from one party to another in licensing agreement. + References No definition available. + Details
Name: | erna_LossContingencyPercentageOfRoyaltyPayable
Namespace Prefix: | erna_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of sublicense fee payable by the company before expiration date as per "Exclusive Factor License Agreement". + References No definition available. + Details
Name: | erna_PercentageOfSublicenseFeePayableBeforeExpirationPeriod
Namespace Prefix: | erna_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of sublicense fee payable by the company during renewal period as per "Exclusive Factor License Agreement". + References No definition available. + Details
Name: | erna_PercentageOfSublicenseFeePayableDuringRenewalTerm
Namespace Prefix: | erna_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Minimum threshold income from sublicenses to the factor patents for automatic extension of license period. + References No definition available. + Details
Name: | erna_ThresholdIncomeForAutomaticExtensionOfLicensePeriod
Namespace Prefix: | erna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=erna_ExclusiveFactorLicenseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=erna_UniversityOfSouthFloridaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |