Cover Page - shares	6 Months Ended
	Jun. 30, 2022	Jul. 29, 2022
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Entity Registrant Name	ONCORUS, INC.
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0001671818
Entity Current Reporting Status	Yes
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Filer Category	Non-accelerated Filer
Entity File Number	001-39575
Entity Address, Address Line One	50 Hampshire Street
Entity Address, Address Line Two	Suite 401
Entity Address, City or Town	Cambridge
Entity Address, State or Province	MA
Entity Tax Identification Number	47-3779757
Entity Address, Postal Zip Code	02139
Entity Incorporation, State or Country Code	DE
City Area Code	(857)
Local Phone Number	320-6400
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Entity Common Stock, Shares Outstanding		25,973,135
Security Exchange Name	NASDAQ
Trading Symbol	ONCR
Title of 12(b) Security	Common Stock, $0.0001 par value per share