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Stockholders' Equity (Deficit) - Schedule of Warrant Activity (Detail) | 3 Months Ended
--- | ---
Mar. 31, 2024 shares
Class Of Warrant Or Right [Line Items] |
Ending Balance | 20,964,302
Common Stock Warrants [Member] |
Class Of Warrant Or Right [Line Items] |
Ending Balance | 15,151,518
Pre-funded Warrants [Member] |
Class Of Warrant Or Right [Line Items] |
Ending Balance | 5,176,270
All Other Warrants [Member] |
Class Of Warrant Or Right [Line Items] |
Ending Balance | 636,514
Common Stock Warrants [Member] |
Class Of Warrant Or Right [Line Items] |
Beginning Balance | 21,564,302
Issued | 0
Exercised | (600,000)
Cancelled/Expired | 0
Common Stock Warrants [Member] | Common Stock Warrants [Member] |
Class Of Warrant Or Right [Line Items] |
Beginning Balance | 15,151,518
Issued | 0
Exercised | 0
Cancelled/Expired | 0
Common Stock Warrants [Member] | Pre-funded Warrants [Member] |
Class Of Warrant Or Right [Line Items] |
Beginning Balance | 5,776,270
Issued | 0
Exercised | (600,000)
Cancelled/Expired | 0
Common Stock Warrants [Member] | All Other Warrants [Member] |
Class Of Warrant Or Right [Line Items] |
Beginning Balance | 636,514
Issued | 0
Exercised | 0
Cancelled/Expired | 0

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
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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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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: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |