| Cover | Mar. 31, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Mar. 31, 2022 |
| Entity Registrant Name | WEJO GROUP LIMITED |
| Entity Incorporation, Country Code | D0 |
| Entity File Number | 001-41091 |
| Entity Tax Identification Number | 98-1611674 |
| Entity Address, Address Line One | Canon’s Court |
| Entity Address, Address Line Two | 22 Victoria Street |
| Entity Address, Country | BM |
| Entity Address, Postal Zip Code | HM12 |
| City Area Code | 44 8002 |
| Local Phone Number | 343065 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of Each Class: | Common shares, par value $0.001 per share |
| Trading Symbol(s) | WEJO |
| Name of Each Exchange on Which Registered: | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity Central Index Key | 0001864448 |
| Amendment Flag | false |
| Entity Address, City or Town | Hamilton |
