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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 28, 2020
Jun. 28, 2019
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Trading Symbol RCUS    
Entity Registrant Name Arcus Biosciences, Inc.    
Entity Central Index Key 0001724521    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Entity Shell Company false    
Entity File Number 001-38419    
Entity Tax Identification Number 47-3898435    
Entity Address, Address Line One 3928 Point Eden Way    
Entity Address, City or Town Hayward    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94545    
City Area Code 510    
Local Phone Number 694-6200    
Entity Interactive Data Current Yes    
Title of 12(b) Security Common Stock, Par Value $0.0001 Per Share    
Security Exchange Name NYSE    
Entity Incorporation, State or Country Code DE    
Document Annual Report true    
Document Transition Report false    
Entity Common Stock, Shares Outstanding   45,974,189  
Entity Public Float     $ 297,967,057
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Registrant’s Definitive Proxy Statement relating to the 2020 Annual Meeting of Shareholders, scheduled to be held on June 4, 2020, are incorporated by reference into Part III of this Report. The Definitive Proxy Statement will be filed within 120 days of the Registrant’s fiscal year ended December 31, 2019.