Cover - shares	9 Months Ended
	Sep. 30, 2024	Oct. 22, 2024
Entity Listings [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Sep. 30, 2024
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
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		27,471,397
Entity Central Index Key	0001818331
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3
Amendment Flag	false
Class A common stock
Entity Listings [Line Items]
Title of 12(b) Security	Class A common stock, par value $0.0001 per share
Trading Symbol	WGS
Security Exchange Name	NASDAQ
Warrant
Entity Listings [Line Items]
Title of 12(b) Security	Warrants to purchase one share of Class A common stock, each at an exercise price of $379.50 per share
Trading Symbol	WGSWW
Security Exchange Name	NASDAQ