Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2025	Aug. 08, 2025
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2025
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q2
Entity Registrant Name	Coya Therapeutics, Inc.
Entity Central Index Key	0001835022
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Shell Company	false
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Security12b Title	Common Stock, par value $0.0001 per share
Trading Symbol	COYA
Security Exchange Name	NASDAQ
Entity File Number	001-41583
Entity Incorporation State Country Code	DE
Entity Tax Identification Number	85-4017781
Entity Address Address Line1	5850 San Felipe St., Suite 500
Entity Address City Or Town	Houston
Entity Address State Or Province	TX
Entity Address Postal Zip Code	77057
City Area Code	800
Local Phone Number	587-8170
Document Quarterly Report	true
Document Transition Report	false
Entity Common Stock, Shares Outstanding		16,725,081