Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2022	May 04, 2022
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q1
Entity Registrant Name	XOMETRY, INC.
Entity Central Index Key	0001657573
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity File Number	001-40546
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	32-0415449
Entity Address, Address Line One	7529 Standish Place
Entity Address, Address Line Two	Suite 200
Entity Address, City or Town	Derwood
Entity Address, State or Province	MD
Entity Address, Postal Zip Code	20855
City Area Code	240
Local Phone Number	335-7914
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		44,304,775
Document Quarterly Report	true
Document Transition Report	false
Title of 12(b) Security	Class A common stock, par value $0.000001 per share
Trading Symbol	XMTR
Security Exchange Name	NASDAQ
Entity Bankruptcy Proceedings, Reporting Current	true