| Cover | Dec. 14, 2021 |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Dec. 14, 2021 |
| Entity File Number | 001-41091 |
| Entity Registrant Name | WEJO GROUP LIMITED |
| Entity Central Index Key | 0001864448 |
| Entity Tax Identification Number | 98-1611674 |
| Entity Incorporation, State or Country Code | D0 |
| Entity Address, Address Line One | Canon’s Court |
| Entity Address, Address Line Two | 22 Victoria Street |
| Entity Address, City or Town | Hamilton |
| Entity Address, Country | BM |
| Entity Address, Postal Zip Code | HM12 |
| City Area Code | +44 |
| Local Phone Number | 8002 343065 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Common shares, par value $0.001 per share [Member] | |
| Title of 12(b) Security | Common shares, par value $0.001 per share |
| Trading Symbol | WEJO |
| Security Exchange Name | NASDAQ |
| Warrants, each whole warrant exercisable for one share of common shares at an exercise price of $11.50 [Member] | |
| Title of 12(b) Security | Warrants, each whole warrant exercisable for one share of common shares at an exercise price of $11.50 |
| Trading Symbol | WEJOW |
| Security Exchange Name | NASDAQ |
