XML 107 R83.htm IDEA: XBRL DOCUMENT
v3.23.1

Subsequent Event (Details) $ in Thousands | Feb. 21, 2023 USD ($)
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Subsequent Event [Member] |
Cell Customization and License Agreement [Abstract] |
Proceeds from option and license agreement | $ 250,000

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

X
- Definition The cash inflow from exclusive option and license agreement as a non-refundable up-front payment. + References No definition available. + Details
Name: | erna_ProceedsFromOptionAndLicenseAgreement
Namespace Prefix: | erna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |