v3.25.2
Cover Page - shares
6 Months Ended
Jun. 30, 2025
Jul. 31, 2025
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Amendment Flag false  
Document Period End Date Jun. 30, 2025  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Entity Registrant Name NewAmsterdam Pharma Company N.V.  
Entity Central Index Key 0001936258  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity File Number 001-41562  
Entity Tax Identification Number 00-0000000  
Entity Address, Address Line One Gooimeer 2-35  
Entity Address, City or Town Naarden  
Entity Address, Country NL  
Entity Address, Postal Zip Code 1411 DC  
City Area Code +31  
Local Phone Number (0) 35 206 2971  
Entity Incorporation, State or Country Code P7  
Document Transition Report false  
Entity Common Stock, Shares Outstanding   112,628,458
Ordinary Shares, Nominal Value €0.12 Per Share    
Document Information [Line Items]    
Title of 12(b) Security Ordinary Shares, nominal value €0.12 per share  
Trading Symbol NAMS  
Security Exchange Name NASDAQ  
Warrants to Purchase Ordinary Shares    
Document Information [Line Items]    
Title of 12(b) Security Warrants to purchase Ordinary Shares  
Trading Symbol NAMSW  
Security Exchange Name NASDAQ