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v3.22.1

Stockholders' Equity - Schedule of Series X1 Convertible Preferred Stock Warrant Activity (Detail) - Preferred Stock Warrants [Member] | 3 Months Ended
--- | ---
Mar. 31, 2022 shares
Class Of Warrant Or Right [Line Items] |
Beginning Balance | 50,207.419
Assumed and replaced | 0
Exercised | 0
Cancelled/Expired | 0
Ending Balance | 50,207.419

X
- Definition Class of warrant or right number of warrants or rights assumed and replaced. + References No definition available. + Details
Name: | eldn_ClassOfWarrantOrRightNumberOfWarrantsOrRightsAssumedAndReplaced
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 cancelled or expired. + References No definition available. + Details
Name: | eldn_ClassOfWarrantOrRightNumberOfWarrantsOrRightsCancelledOrExpired
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
Name: | eldn_ClassOfWarrantOrRightNumberOfWarrantsOrRightsExercised
Namespace Prefix: | eldn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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
Name: | us-gaap_ClassOfWarrantOrRightLineItems
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
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=eldn_PreferredStockWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |