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CONTRACT WITH CUSTOMER (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Feb. 21, 2023	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
CONTRACT WITH CUSTOMER [Abstract]
Proceeds from option and license agreement	$ 250
Performance obligation, percentage	100.00%
Deferred revenue related to option fee		$ 250		$ 250		$ 0
Option fee obligation payment percentage		20.00%
License costs		$ 0	$ 0	$ 50	$ 0

X

- Definition

The aggregate licensing costs related to revenues.

+ References

No definition available.

+ Details

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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

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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

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

X

- Definition

Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as noncurrent.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(26)(c))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

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Namespace Prefix:	us-gaap_
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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
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-SubTopic 10
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-13

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