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SUBSEQUENT EVENT (Details) - Subsequent Event [Member]	May 03, 2024 USD ($)
Operating Costs and Expenses [Abstract]
Past due rent amount	$ 2,300,000
Late fees and interest payment due on rent amount	$ 70,000

X

- Definition

The amount of expense provided in the period for late fees and interest due on rent payments.

+ References

No definition available.

+ Details

Name:	erna_LateFeesAndInterestPaymentsDue
Namespace Prefix:	erna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of operating lease expense to be paid for the month of February, March, April or May 2024 including share amounts related to property taxes and common area maintenance costs.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_OperatingCostsAndExpensesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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