XML 17 R1.htm IDEA: XBRL DOCUMENT v3.22.0.1
Cover Page - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2021
Jan. 31, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
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 4453 North First Street    
Entity Address, Address Line Two Suite 100    
Entity Address, City or Town San Jose    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 95134    
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    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 1.8
Entity Common Stock, Shares Outstanding   109,315,425  
Documents Incorporated by Reference Certain information is incorporated into Part III of this report by reference to the Proxy Statement for the Registrant’s annual meeting of stockholders to be held on or about April 28, 2022 to be filed with the Securities and Exchange Commission pursuant to Regulation 14A not later than 120 days after the end of the fiscal year covered by this Form 10-K.    
Entity Central Index Key 0000917273    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Auditor Firm ID 238