Condensed Consolidated Balance Sheets - USD ($)	Mar. 31, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 8,496,000	$ 20,549,000
Short-term investments	116,385,000	119,629,000
Prepaid expenses and other current assets	2,837,000	3,552,000
Total current assets	127,718,000	143,730,000
Operating lease asset, net	850,000	926,000
In-process research and development	32,386,000	32,386,000
Other assets	354,000	363,000
Total assets	161,308,000	177,405,000
Current liabilities:
Accounts payable	2,901,000	5,833,000
Current operating lease liabilities	325,000	314,000
Accrued expenses and other liabilities	5,959,000	5,430,000
Total current liabilities	9,185,000	11,577,000
Deferred tax liabilities	2,183,000	2,183,000
Non-current operating lease liabilities	555,000	640,000
Warrant liabilities	34,805,000	44,865,000
Total liabilities	46,728,000	59,265,000
Commitments and contingencies (Note 7)
Stockholders' equity:
Common stock, $0.001 par value, 200,000,000 shares authorized at March 31, 2025 and December 31, 2024; 59,881,775 and 59,789,275 shares issued and outstanding at March 31, 2025 and December 31, 2024, respectively	60,000	60,000
Additional paid-in capital	420,925,000	417,946,000
Accumulated other comprehensive income (loss)	(18,000)	26,000
Accumulated deficit	(362,081,000)	(355,586,000)
Total stockholders’ equity	58,886,000	62,446,000
Total liabilities, convertible preferred stock and stockholders' equity	161,308,000	177,405,000
Series X1 Non-voting Convertible Preferred Stock [Member]
Temporary Equity [Abstract]
Temporary equity, value	53,543,000	53,543,000
Stockholders' equity:
Preferred stock, value
Series X Non-Voting Convertible Preferred Stock [Member]
Temporary Equity [Abstract]
Temporary equity, value	2,151,000	$ 2,151,000
Stockholders' equity:
Preferred stock, value

In-process research and development.

No definition available.

Name:	eldn_InProcessResearchAndDevelopment
Namespace Prefix:	eldn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).