| Cover | Jul. 26, 2021 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jul. 26, 2021 |
| Entity File Number | 001-37825 |
| Entity Registrant Name | Talend S.A. |
| Entity Central Index Key | 0001668105 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Incorporation, State or Country Code | I0 |
| Entity Address, Address Line One | 5-7, rue Salomon de Rothschild |
| Entity Address, City or Town | Suresnes |
| Entity Address, Country | FR |
| Entity Address, Postal Zip Code | 92150 |
| Country Region | +33 |
| City Area Code | (0) 1 4 |
| Local Phone Number | 6 25 06 00 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Ordinary shares, nominal value €0.08 per share* |
| Trading Symbol | TLND |
| Security Exchange Name | NASDAQ |
| American Depositary Shares [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | American Depositary Shares, each representing one ordinary share, nominal value €0.08 per share |
| Trading Symbol | TLND |
| Security Exchange Name | NASDAQ |
