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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Feb. 23, 2020
Jun. 28, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 001-36384    
Entity Registrant Name THE RUBICON PROJECT, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 20-8881738    
Entity Address, Address Line One 12181 Bluff Creek Drive,    
Entity Address, Address Line Two 4th Floor    
Entity Address, City or Town Los Angeles,    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 90094    
City Area Code 310    
Local Phone Number 207-0272    
Title of 12(b) Security Common stock, par value $0.00001 per share    
Trading Symbol RUBI    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 321.4
Entity Common Stock, Shares Outstanding   55,040,645  
Documents Incorporated by Reference
None

    
Entity Central Index Key 0001595974    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31