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Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]      
Employee contribution limit per calendar year to 401 (k) Plan (as a percent of compensation) 60.00%rmbs_DefinedContributionPlanEmployeeContributionLimitPercentageOfCompensation    
Employer match of employee contributions of first 6% of eligible compensation (as a percent) 50.00%rmbs_DefinedContributionPlanEmployerMatchLevelOne    
Percentage of eligible compensation, matched 50% by employer 6.00%rmbs_DefinedContributionPlanEmployerMatchEmployeeContributionLevelOne    
Company's contribution to benefit plan $ 1.9rmbs_DefinedContributionPlanEmployerContribution $ 1.8rmbs_DefinedContributionPlanEmployerContribution $ 2.1rmbs_DefinedContributionPlanEmployerContribution