Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	Apr. 29, 2021
Document And Entity Information
Document Quarterly Report	true
Document Transition Report	false
Document Type	10-Q
Document Period End Date	Mar. 31, 2021
Entity Registrant Name	Corvus Pharmaceuticals, Inc.
Entity Tax Identification Number	46-4670809
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity File Number	001-37719
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	863 Mitten Road, Suite 102
Entity Address, City or Town	Burlingame
Entity Address, Postal Zip Code	94010
Entity Address, State or Province	CA
City Area Code	650
Local Phone Number	900-4520
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Shell Company	false
Title of 12(b) Security	Common Stock
Security Exchange Name	NASDAQ
Trading Symbol	CRVS
Entity Common Stock, Shares Outstanding		38,309,551
Entity Central Index Key	0001626971
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false