XML 56 R49.htm IDEA: XBRL DOCUMENT
v3.25.2

Preferred Stock and Stockholders' Equity - Schedule of Company's Outstanding Warrants to Purchase Shares of Common Stocky (Detail) - Common Stock Warrants [Member] - $ / shares | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Class of Warrant or Right [Line Items] |  |
Number of Shares of Common Stock Issuable | 33,052,744 | 33,052,744
January 2020 Common Warrants |  |
Class of Warrant or Right [Line Items] |  |
Number of Shares of Common Stock Issuable | 5,586 |
Warrants exercise price | $ 18.9 |
Expiration Date | Jul. 14, 2025 |
January 2020 Common Warrants |  |
Class of Warrant or Right [Line Items] |  |
Number of Shares of Common Stock Issuable | 3,591 |
Warrants exercise price | $ 18.9 |
Expiration Date | Jul. 17, 2025 |
January 2020 Common Warrants |  |
Class of Warrant or Right [Line Items] |  |
Number of Shares of Common Stock Issuable | 247,264 |
Warrants exercise price | $ 12.96 |
Expiration Date | Jul. 14, 2025 |
January 2020 Common Warrants |  |
Class of Warrant or Right [Line Items] |  |
Number of Shares of Common Stock Issuable | 71,800 |
Warrants exercise price | $ 12.96 |
Expiration Date | Jul. 17, 2025 |
September 2020 Common Warrants |  |
Class of Warrant or Right [Line Items] |  |
Number of Shares of Common Stock Issuable | 298,692 |
Warrants exercise price | $ 3.08 |
Expiration Date | Sep. 14, 2025 |
2023 Securities Purchase Agreement Common Warrants |  |
Class of Warrant or Right [Line Items] |  |
Number of Shares of Common Stock Issuable | 15,151,518 |
Warrants exercise price | $ 3 |
Expiration Date | May 05, 2028 |
January 2021 Pre-funded Warrants |  |
Class of Warrant or Right [Line Items] |  |
Number of Shares of Common Stock Issuable | 509,117 |
Warrants exercise price | $ 0.001 |
Expiration Date | Dec. 31, 2030 |
2023 Securities Purchase Agreement Pre-funded Warrants |  |
Class of Warrant or Right [Line Items] |  |
Number of Shares of Common Stock Issuable | 3,844,153 |
Warrants exercise price | $ 0.001 |
2024 Securities Purchase Agreement Pre-funded Warrants |  |
Class of Warrant or Right [Line Items] |  |
Number of Shares of Common Stock Issuable | 7,989,516 |
Warrants exercise price | $ 0.001 |
2024 Underwritten Offering Pre-funded Warrants |  |
Class of Warrant or Right [Line Items] |  |
Number of Shares of Common Stock Issuable | 4,931,507 |
Warrants exercise price | $ 0.001 |

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-3 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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
- Definition Expiration date of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in YYYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_WarrantsAndRightsOutstandingMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=eldn_CommonStockWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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

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

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

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

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

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