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Business Acquisition - Schedule of Unaudited Pro Forma Combined Financial Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2020
Business Combinations [Abstract] |  |
Net loss and other comprehensive loss | $ (3,430) | $ (13,727)

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

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration