v3.26.3
Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Valuation allowance          
Provision for income taxes $ 15,970 $ 20,911 $ 36,626 $ 38,135  
Income taxes paid 6,100 $ 5,100 17,000 $ 16,100  
Unrecognized tax benefits, excluding interest 26,400   26,400   $ 108,000
Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesNoncurrent          
Valuation allowance          
Unrecognized tax benefits, excluding interest 800   800   1,000
Location, Statement of Financial Position, Balance [Axis]: rmbs:DeferredTaxAssetsLongTerm          
Valuation allowance          
Unrecognized tax benefits, excluding interest 25,600   $ 25,600   24,300
National Tax Services | Foreign tax authority          
Valuation allowance          
Unrecognized tax benefits, decrease resulting from withdrawal of refund claim $ 82,700        
National Tax Services | Foreign tax authority | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsNoncurrent          
Valuation allowance          
Unrecognized tax benefits, excluding interest         $ 82,700