XML 78 R58.htm IDEA: XBRL DOCUMENT v3.24.0.1

Fair Value of Financial Instruments, Changes in Warrant Liabilities (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) $ / shares	Dec. 31, 2022 USD ($)	Apr. 26, 2023 USD ($)
Valuation Technique and Input, Description [Abstract]
Remeasurement of contingent consideration	$ 100,000
Change in fair value of contingent consideration	0	$ 118,000	$ 0
Expected Term [Member]
Valuation Technique and Input, Description [Abstract]
Expected life		3 years
Risk Free Rate [Member]
Valuation Technique and Input, Description [Abstract]
Measurement input				0.0358
Volatility [Member]
Valuation Technique and Input, Description [Abstract]
Measurement input				1
Dividend Yield [Member]
Valuation Technique and Input, Description [Abstract]
Measurement input				0
Stock Price [Member]
Valuation Technique and Input, Description [Abstract]
Measurement input				3
Contingent Consideration [Member]
Changes in Fair Value of Warrant Liabilities [Roll Forward]
Fair value, beginning of period	0	$ 0
Initial measurement		225,000
Change in fair value		(118,000)
Fair value, end of period		$ 107,000	0
Contingent Consideration [Member] | Expected Term [Member]
Valuation Technique and Input, Description [Abstract]
Expected life		2 years 3 months 18 days
Contingent Consideration [Member] | Risk Free Rate [Member]
Valuation Technique and Input, Description [Abstract]
Measurement input		0.0407
Contingent Consideration [Member] | Volatility [Member]
Valuation Technique and Input, Description [Abstract]
Measurement input		1.08
Contingent Consideration [Member] | Dividend Yield [Member]
Valuation Technique and Input, Description [Abstract]
Measurement input		0
Contingent Consideration [Member] | Stock Price [Member]
Valuation Technique and Input, Description [Abstract]
Measurement input | $ / shares		1.8
Warrant Liabilities [Member]
Changes in Fair Value of Warrant Liabilities [Roll Forward]
Fair value, beginning of period	$ 331,000	$ 331,000
Initial measurement		0
Change in fair value		(215,000)
Fair value, end of period		$ 116,000	$ 331,000
Warrant Liabilities [Member] | Expected Term [Member]
Valuation Technique and Input, Description [Abstract]
Expected life		3 years 8 months 8 days
Warrant Liabilities [Member] | Risk Free Rate [Member]
Valuation Technique and Input, Description [Abstract]
Measurement input		0.0393
Warrant Liabilities [Member] | Volatility [Member]
Valuation Technique and Input, Description [Abstract]
Measurement input		1.03
Warrant Liabilities [Member] | Dividend Yield [Member]
Valuation Technique and Input, Description [Abstract]
Measurement input		0

X

- Definition

Amount of change in fair value of contingent consideration.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479581/805-30-50-4

+ Details

Name:	us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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

X

- Definition

Amount of issuances 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
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

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

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

Name:	us-gaap_LiabilitiesFairValueAdjustment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_WarrantsAndRightsOutstandingMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_WarrantsAndRightsOutstandingTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputExpectedTermMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputRiskFreeInterestRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputPriceVolatilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputExpectedDividendRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputSharePriceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ContingentConsiderationByTypeAxis=erna_ContingentConsiderationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: