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FAIR VALUE OF FINANCIAL INSTRUMENTS, Changes in Warrant Liabilities (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)
Changes in Fair Value of Warrant Liabilities [Roll Forward]
Change in fair value of contingent consideration	$ 0
Contingent Consideration [Member]
Changes in Fair Value of Warrant Liabilities [Roll Forward]
Fair value, beginning of period	107
Change in fair value	0
Fair value, end of period	107
Warrant Liabilities [Member]
Changes in Fair Value of Warrant Liabilities [Roll Forward]
Fair value, beginning of period	116
Change in fair value	70
Fair value, end of period	$ 186

X

- Definition

Amount of change in fair value of contingent consideration.

+ References

No definition available.

+ Details

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

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-SubTopic 10
-Topic 820
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

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X

- Definition

Amount of addition (reduction) to the amount at which a liability could be incurred (settled) in a current transaction between willing parties.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: