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Cover Page
 3 Months Ended
Mar. 31, 2022
shares
Cover [Abstract]  
Document Type 10-Q
Document Quarterly Report true
Document Period End Date Mar. 31, 2022
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 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 Common Stock, Shares Outstanding 110,235,608
Entity Central Index Key 0000917273
Current Fiscal Year End Date --12-31
Document Fiscal Year Focus 2022
Document Fiscal Period Focus Q1
Amendment Flag false