Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Current assets:
Cash	$ 9,177	$ 1,884
Prepaid expenses and other current assets	724	404
Total current assets	9,996	3,133
Property and equipment, net	88	94
Right-of-use assets - operating leases, net	349	453
Goodwill		2,044
Other assets	110	110
Total assets	10,543	5,834
Current liabilities:
Accounts payable	1,300	1,125
Accrued expenses	1,481	898
Income taxes payable	4	3
Operating lease liabilities, current	163	213
Due to related party	250	750
Contingent consideration liability	41	41
Other current liabilities	218	83
Total current liabilities	3,457	3,113
Operating lease liabilities, non-current	226	277
Other liabilities	1	43
Total liabilities	3,684	3,433
Stockholders’ equity:
Preferred stock, $0.005 par value, 1,000 shares authorized, 156 designated and outstanding of Series A convertible preferred stock at March 31, 2026 and December 31, 2025, $156 liquidation preference	1	1
Common stock, $0.005 par value, 150,000 shares authorized at March 31, 2026 and December 31, 2025, 1,166 and 314 issued and outstanding at March 31, 2026 and December 31, 2025, respectively	6	2
Additional paid-in capital	257,994	248,034
Accumulated deficit	(251,142)	(245,636)
Total stockholders’ equity	6,859	2,401
Total liabilities and stockholders’ equity	10,543	5,834
Nonrelated Party [Member]
Current assets:
Due from related party	95	95
Related Party [Member]
Current assets:
Due from related party		$ 750

Due to related party current.

No definition available.

Name:	ERNA_DueToRelatedPartyCurrent
Namespace Prefix:	ERNA_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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).