XML 55 R41.htm IDEA: XBRL DOCUMENT v3.22.2.2

LEASES, Operating Lease (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2022 USD ($) ft²	Sep. 30, 2022 USD ($) ft²	Sep. 30, 2021 USD ($)	Mar. 05, 2022 USD ($)
Operating Leases [Abstract]
Operating lease area | ft²	5,200	5,200
Lease term	62 months	62 months
Base rent (per square foot) | ft²		6.35
Percentage of increase in base rent on each year	3.00%	3.00%
Extended lease term	5 years	5 years
Initial measurement of operating lease ROU assets		$ 1,706,000
Initial measurement of operating lease liabilities		1,706,000	$ 866,000
Impairment of ROU assets	$ 0	$ (772,000)	$ 0
Commitment to purchase equipment				$ 50,000
Unamortized leasehold improvements				50,000
Security deposit				$ 63,000

X

- Definition

Amount of base rent expense per square foot for leased asset.

+ References

No definition available.

+ Details

Name:	erna_BaseRentPerSquareFoot
Namespace Prefix:	erna_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The fair value of initial measurement of operating lease liabilities in noncash financing activities.

+ References

No definition available.

+ Details

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

X

- Definition

The fair value of initial measurement of operating lease ROU assets.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of property for which lessee committed to purchase.

+ References

No definition available.

+ Details

Name:	erna_LesseeCommitmentToPurchaseProperty
Namespace Prefix:	erna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Area of leased property under operating lease.

+ References

No definition available.

+ Details

Name:	erna_OperatingLeaseArea
Namespace Prefix:	erna_
Data Type:	dtr-types:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The percentage of base rent increase on each anniversary.

+ References

No definition available.

+ Details

Name:	erna_PercentageBaseRentIncreaseOnEachAnniversary
Namespace Prefix:	erna_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The amount of unamortized leasehold improvements.

+ References

No definition available.

+ Details

Name:	erna_UnamortizedLeaseholdImprovements
Namespace Prefix:	erna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DepositsAssetsNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Term of lessee's operating lease renewal, 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980

+ Details

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

X

- Definition

Term of lessee's operating lease, 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980

+ Details

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

X

- Definition

Amount of loss from impairment of right-of-use asset from operating lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 25
-Paragraph 6
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=123399704&loc=SL77918431-209957

+ Details

Name:	us-gaap_OperatingLeaseImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration