Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 101,133	$ 114,195
Prepaid expenses and other current assets	1,449	1,435
Total current assets	102,582	115,630
Operating lease asset, net	267	138
Goodwill	48,648	48,648
In-process research and development	32,386	32,386
Other assets	422	383
Total assets	184,305	197,185
Current liabilities:
Accounts payable	857	1,366
Current operating lease liability	179	144
Accrued expenses and other liabilities	1,641	973
Total current liabilities	2,677	2,483
Deferred tax liabilities	3,017	4,106
Non-current operating lease liability	90
Total liabilities	5,784	6,589
Commitments and contingencies (Note 5)
Stockholders’ equity:
Common stock, $0.001 par value, 200,000,000 shares authorized at June 30, 2021 and December 31, 2020; 14,306,614 and 15,160,397 shares issued and outstanding at June 30, 2021 and December 31, 2020, respectively	14	15
Additional paid-in capital	274,783	270,974
Accumulated deficit	(96,276)	(80,393)
Total stockholders’ equity	178,521	190,596
Total liabilities and stockholders’ equity	184,305	197,185
Series X1 Non-voting Convertible Preferred Stock [Member]
Stockholders’ equity:
Preferred stock, value
Series X Preferred Stock [Member]
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).