| Cover | Feb. 10, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 10, 2022 |
| Entity Registrant Name | Datadog, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 27-2825503 |
| Entity File Number | 001-39051 |
| Entity Address, Postal Zip Code | 10018 |
| City Area Code | 866 |
| Local Phone Number | 329-4466 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A Common Stock, par value $0.00001 per share |
| Trading Symbol | DDOG |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001561550 |
| Amendment Flag | false |
| Entity Address, Address Line One | 620 8th Avenue, |
| Entity Address, Address Line Two | 45th Floor |
| Entity Address, State or Province | NY |
| Entity Address, City or Town | New York, |
