| Document and Entity Information | Nov. 06, 2024 |
| Document And Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Nov. 06, 2024 |
| Entity Registrant Name | NewAmsterdam Pharma Company N.V. |
| Entity Incorporation State Country Code | P7 |
| Entity File Number | 001-41562 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Address Address Line 1 | Goomieer 2-35 |
| Entity Address City Or Town | Naarden |
| Entity Address Country | NL |
| Entity Address Postal Zip Code | 1411 DC |
| Country Region | 31 |
| City Area Code | (0) 35 |
| Local Phone Number | 206 2971 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity Central Index Key | 0001936258 |
| Amendment Flag | false |
| Common Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Ordinary shares, nominal value €0.12 per share |
| Trading Symbol | NAMS |
| Security Exchange Name | NASDAQ |
| Warrant [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Warrants to purchase ordinary shares |
| Trading Symbol | NAMSW |
| Security Exchange Name | NASDAQ |
