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CONTRACT WITH CUSTOMER (Details) - USD ($) $ in Thousands		3 Months Ended
	Feb. 21, 2023	Mar. 31, 2023	Mar. 31, 2022
CONTRACT WITH CUSTOMER [Abstract]
Performance obligation, percentage	100.00%
Proceeds from option and license agreement	$ 250
License costs		$ 50	$ 0
Option fee obligation payment percentage		20.00%
Deferred Revenue Related to Upfront and Nonrefundable Option Fee		$ 250

X

- Definition

Deferred revenue related to upfront and nonrefundable option fee.

+ References

No definition available.

+ Details

Name:	erna_DeferredRevenueRelatedToUpfrontAndNonrefundableOptionFee
Namespace Prefix:	erna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The aggregate licensing costs related to revenues.

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of obligated to payments of the option fees.

+ References

No definition available.

+ Details

Name:	erna_OptionFeeObligationPaymentPercentage
Namespace Prefix:	erna_
Data Type:	dtr-types:percentItemType
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

- References

No definition available.

+ Details

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

X

- Definition

Percentage of remaining performance obligation to total remaining performance obligation not recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130556-203045

+ Details

Name:	us-gaap_RevenueRemainingPerformanceObligationPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant