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Commitments and Contingencies, Licensing Agreements (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Nov. 30, 2022	Dec. 31, 2022
Exclusive Factor License Agreement [Member]
Licensing Agreements [Abstract]
License agreement term		5 years
License agreement extension term		2 years 6 months
Threshold income for automatic extension of license period	$ 100
Percentage of sublicense fee payable by company before expiration date	20.00%
Percentage of sublicense fee payable by company during renewal term	30.00%
University of South Florida [Member]
Licensing Agreements [Abstract]
Percentage of royalty payable		7.00%

X

- Definition

The term of license agreement to be extendable, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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X

- Definition

License agreement term in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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X

- References

No definition available.

+ Details

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X

- Definition

Percentage of royalty payable from one party to another in licensing agreement.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Percentage of sublicense fee payable by the company before expiration date as per "Exclusive Factor License Agreement".

+ References

No definition available.

+ Details

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Namespace Prefix:	erna_
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X

- Definition

Percentage of sublicense fee payable by the company during renewal period as per "Exclusive Factor License Agreement".

+ References

No definition available.

+ Details

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X

- Definition

Minimum threshold income from sublicenses to the factor patents for automatic extension of license period.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Details

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X

- Details

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