Cover Page - shares	3 Months Ended
	Mar. 31, 2025	May 02, 2025
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Amendment Flag	false
Document Period End Date	Mar. 31, 2025
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q1
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		112,270,677
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