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Stockholders' Equity - Schedule of Series X1 Convertible Preferred Stock Warrant Activity (Detail)	9 Months Ended
	Sep. 30, 2023 shares
Class Of Warrant Or Right [Line Items]
Ending Balance	22,217,302
Preferred Stock Warrants [Member]
Class Of Warrant Or Right [Line Items]
Beginning Balance	50,207.419
Issued	0
Exercised	0
Cancelled/Expired	0
Ending Balance	50,207.419

X

- Definition

Class of warrant or right number of warrants or rights cancelled or expired.

+ References

No definition available.

+ Details

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Namespace Prefix:	eldn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Class of warrant or right number of warrants exercised.

+ References

No definition available.

+ Details

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Namespace Prefix:	eldn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Class of warrant or right number of warrants or rights issued.

+ References

No definition available.

+ Details

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Namespace Prefix:	eldn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

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