| Cover | Mar. 05, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Mar. 05, 2024 |
| Entity Registrant Name | Couchbase, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-40601 |
| Entity Tax Identification Number | 26-3576987 |
| Entity Address, Address Line One | 3250 Olcott Street |
| Entity Address, City or Town | Santa Clara |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 95054 |
| City Area Code | 650 |
| Local Phone Number | 417-7500 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, $0.00001 par value per share |
| Trading Symbol | BASE |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Central Index Key | 0001845022 |
| Amendment Flag | false |
| Entity Ex Transition Period | false |
