XML 77 R56.htm IDEA: XBRL DOCUMENT
v3.22.1

Business Acquisition - Schedule of Unaudited Pro Forma Combined Financial Information (Detail) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) $ / shares shares
Business Combinations [Abstract] |
Revenue | $ 120
Operating expenses |
Research and development | 9,489
General and administrative | 8,317
Restructuring expense | 2,282
Total operating expenses | 20,088
Loss from operations | (19,968)
Other income (expense), net | 79
Warrant inducement expense | (4,829)
Loss before provision for income taxes | (24,718)
Income tax benefit | 404
Net loss and other comprehensive loss | $ (24,314)
Net loss per share, basic and diluted | $ / shares | $ (15.44)
Weighted-average shares outstanding, basic and diluted | shares | 1,574,657

X
- Definition Business acquisition, pro forma earnings per share, basic and diluted. + References No definition available. + Details
Name: | eldn_BusinessAcquisitionProFormaEarningsPerShareBasicAndDiluted
Namespace Prefix: | eldn_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Business acquisition pro forma general and administrative expense. + References No definition available. + Details
Name: | eldn_BusinessAcquisitionProFormaGeneralAndAdministrativeExpense
Namespace Prefix: | eldn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Business acquisition pro forma income loss before provision for income taxes. + References No definition available. + Details
Name: | eldn_BusinessAcquisitionProFormaIncomeLossBeforeProvisionForIncomeTaxes
Namespace Prefix: | eldn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Business acquisition pro forma income tax expense benefit. + References No definition available. + Details
Name: | eldn_BusinessAcquisitionProFormaIncomeTaxExpenseBenefit
Namespace Prefix: | eldn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Business acquisition, pro forma net income (loss) and other comprehensive income (loss). + References No definition available. + Details
Name: | eldn_BusinessAcquisitionProFormaNetIncomeLossAndOtherComprehensiveIncomeLoss
Namespace Prefix: | eldn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Business acquisition, pro forma operating expenses. + References No definition available. + Details
Name: | eldn_BusinessAcquisitionProFormaOperatingExpenses
Namespace Prefix: | eldn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Business acquisition, pro forma operating expenses. + References No definition available. + Details
Name: | eldn_BusinessAcquisitionProFormaOperatingExpensesAbstract
Namespace Prefix: | eldn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Business acquisition, pro forma operating income (loss). + References No definition available. + Details
Name: | eldn_BusinessAcquisitionProFormaOperatingIncomeLoss
Namespace Prefix: | eldn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Business acquisition, pro forma other nonoperating income (expense). + References No definition available. + Details
Name: | eldn_BusinessAcquisitionProFormaOtherNonoperatingIncomeExpense
Namespace Prefix: | eldn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Business acquisition pro forma warrant inducement expense. + References No definition available. + Details
Name: | eldn_BusinessAcquisitionProFormaWarrantInducementExpense
Namespace Prefix: | eldn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Business acquisition pro forma weighted average number of shares outstanding, basic and diluted. + References No definition available. + Details
Name: | eldn_BusinessAcquisitionProFormaWeightedAverageNumberOfSharesOutstandingBasicAndDiluted
Namespace Prefix: | eldn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Business acquisitions pro forma research and development expense. + References No definition available. + Details
Name: | eldn_BusinessAcquisitionsProFormaResearchAndDevelopmentExpense
Namespace Prefix: | eldn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Business acquisitions pro forma restructuring expense. + References No definition available. + Details
Name: | eldn_BusinessAcquisitionsProFormaRestructuringExpense
Namespace Prefix: | eldn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessAcquisitionsProFormaRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_BusinessCombinationsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration