| Cover | Feb. 20, 2025 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Feb. 20, 2025 |
| Entity File Number | 001-40241 |
| Entity Registrant Name | LAVA Therapeutics NV |
| Entity Central Index Key | 0001840748 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Incorporation, State or Country Code | P7 |
| Entity Address, Address Line One | Yalelaan 62 |
| Entity Address, City or Town | Utrecht |
| Entity Address, Country | NL |
| Entity Address, Postal Zip Code | 3584 |
| City Area Code | +31 |
| Local Phone Number | 85 016 3100 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common shares, nominal value €0.12 per share |
| Trading Symbol | LVTX |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
