XML 97 R1.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Cover Page - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2019
Jan. 31, 2020
Jun. 30, 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 000-22339    
Entity Registrant Name RAMBUS INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 94-3112828    
Entity Address, Address Line One 1050 Enterprise Way    
Entity Address, Address Line Two Suite 700    
Entity Address, City or Town Sunnyvale    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94089    
City Area Code 408    
Local Phone Number 462-8000    
Title of 12(b) Security Common Stock, $.001 Par Value    
Trading Symbol RMBS    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 1.1
Entity Common Stock, Shares Outstanding   112,429,523  
Entity Central Index Key 0000917273    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY