Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2024	May 13, 2024
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Document Transition Report	false
Entity File Number	001-11460
Entity Registrant Name	Eterna Therapeutics Inc.
Entity Central Index Key	0000748592
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	31-1103425
Entity Address, Address Line One	1035 Cambridge Street, Suite 18A
Entity Address, City or Town	Cambridge
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02141
City Area Code	212
Local Phone Number	582-1199
Title of 12(b) Security	Common stock, $0.005 par value per share
Trading Symbol	ERNA
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		5,410,331