Cover - shares	9 Months Ended
	Sep. 30, 2026	Nov. 02, 2026
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2026
Document Transition Report	false
Entity File Number	001-39482
Entity Registrant Name	GeneDx Holdings Corp.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	85-1966622
Entity Address, Address Line One	333 Ludlow Street
Entity Address, Address Line Two	North Tower
Entity Address, Address Line Three	6th Floor
Entity Address, City or Town	Stamford
Entity Address, State or Province	CT
Entity Address, Postal Zip Code	06902
City Area Code	888
Local Phone Number	729-1206
Title of 12(b) Security	Class A common stock, par value $0.0001 per share
Trading Symbol	WGS
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		29,972,493
Entity Central Index Key	0001818331
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q3
Amendment Flag	false