| Cover | Nov. 10, 2021 | Aug. 11, 2021 |
| Cover [Abstract] | ||
| Document Type | 8-K | |
| Document Period End Date | Nov. 10, 2021 | |
| Entity Registrant Name | 1STDIBS.COM, INC. | |
| Entity Incorporation, State or Country Code | DE | |
| Entity File Number | 001-40453 | |
| Entity Tax Identification Number | 94-3389618 | |
| Entity Address, Address Line One | 51 Astor Place, 3rd Floor | |
| Entity Address, City or Town | New York | |
| Entity Address, State or Province | NY | |
| Entity Address, Postal Zip Code | 10003 | |
| Local Phone Number | 627-3927 | |
| City Area Code | 212 | |
| Written Communications | false | |
| Soliciting Material | false | |
| Pre-commencement Tender Offer | false | |
| Pre-commencement Issuer Tender Offer | false | |
| Title of 12(b) Security | Common Stock, $0.01 par value per share | |
| Trading Symbol | DIBS | |
| Security Exchange Name | NASDAQ | |
| Entity Emerging Growth Company | true | |
| Entity Ex Transition Period | false | |
| Entity Central Index Key | 0001600641 | |
| Amendment Flag | false |
