| Document And Entity Information | Nov. 10, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 10, 2022 |
| Entity Registrant Name | Xometry, Inc. |
| Entity Central Index Key | 0001657573 |
| Entity Emerging Growth Company | true |
| Securities Act 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, 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 Information, Former Legal or Registered Name | Not applicable |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Ex Transition Period | true |
| Title of 12(b) Security | Class A common stock, par value $0.000001 per share |
| Trading Symbol | XMTR |
| Security Exchange Name | NASDAQ |
