Cover Page - shares	3 Months Ended
	Mar. 31, 2023	May 01, 2023
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
Trading Symbol	ATAI
Title of 12(b) Security	Common shares, par value €0.10 per share
Security Exchange Name	NASDAQ
Entity Registrant Name	ATAI Life Sciences N.V.
Entity Central Index Key	0001840904
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		166,010,476
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity File Number	001-40493
Entity Incorporation, State or Country Code	P7
Document Transition Report	false
Entity Address, Address Line One	ATAI Life Sciences N.V.
Entity Address, Address Line Two	Wallstraße 16, 10179
Entity Address, City or Town	Berlin
City Area Code	49 89
Local Phone Number	2153 9035
Entity Address, Country	DE
Entity Address, Postal Zip Code	00000
Entity Tax Identification Number	00-0000000