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Equity Incentive Plans and Stock-Based Compensation (Details 2) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended
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Apr. 30, 2009 | Jun. 30, 2012 | Apr. 24, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 22, 2012 | Jun. 30, 2012
Shares available for grant |  |  |  |  |  |  |  |  |  |  |
Increase in shares approved for issuance | 6,500,000 rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalNumberOfSharesAuthorized | 6,500,000 rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalNumberOfSharesAuthorized |  |  |  |  |  |  |  |  |
Stock Compensation Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Shares available for grant |  |  |  |  |  |  |  |  |  |  |
Increase in shares approved for issuance |  |  | 10,000,000 rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember |  |  |  |  |  |  |  |
Shares available, at the end of the period |  |  |  | 10,724,228 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember |  |  |  |  |  |  |
Options |  |  |  |  |  |  |  |  |  |  |
Shares available for grant |  |  |  |  |  |  |  |  |  |  |
Stock options granted (in shares) |  |  |  | (2,370,313)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | (2,084,276)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | (7,789,220)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Stock options forfeited (in shares) |  |  |  | 1,400,349 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 3,318,022 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 2,610,812 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Options granted (in dollars per share) |  |  |  | $ 9.63 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | $ 6.09 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | $ 5.81 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Options surrendered in stock option exchange program |  |  |  |  |  |  |  | 6,449,255 rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsSurrendedInExchangeOptionsProgramInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Expected weighted-average period for recognition of compensation cost (in years) |  |  |  | 1 year 11 months 19 days |  |  |  |  |  |  |
Stock Option Exchange Program | Options |  |  |  |  |  |  |  |  |  |  |
Shares available for grant |  |  |  |  |  |  |  |  |  |  |
Stock options granted (in shares) |  |  |  |  |  |  |  | (2,840,986)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = rmbs_StockOptionExchangeProgramMember |  |  |
Minimum contractual term of options granted in stock option exchange program (in years) |  |  |  |  |  |  |  |  |  |  | 5 years
Vesting period |  |  |  |  |  |  |  | 3 years |  |  |
Incremental compensation cost of new options granted |  |  |  |  |  |  |  | $ 1.0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = rmbs_StockOptionExchangeProgramMember |  |  |
Unrecognized compensation cost of original options |  |  |  |  |  |  |  |  |  | $ 19.9 rmbs_EmployeeServiceShareBasedCompensationNonVestedAwardsCompensationCostBeforeIncrementalCompensationExpenseNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = rmbs_StockOptionExchangeProgramMember |
Options granted (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 5.63 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = rmbs_StockOptionExchangeProgramMember |
Options surrendered in stock option exchange program |  |  |  |  |  |  |  | 6,449,255 rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsSurrendedInExchangeOptionsProgramInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = rmbs_StockOptionExchangeProgramMember |  |  |
Expected weighted-average period for recognition of compensation cost (in years) |  |  |  |  |  |  |  | 3 years |  |  |
Stock-Based Incentive Compensation Plans |  |  |  |  |  |  |  |  |  |  |
Shares available for grant |  |  |  |  |  |  |  |  |  |  |
Shares available, at the beginning of the year |  |  |  | 2,527,428 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  | 2,729,159 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  | 2,812,876 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |  |
Increase in shares approved for issuance |  |  |  | 10,000,000 rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalNumberOfSharesAuthorized / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |  |  | 6,500,000 rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalNumberOfSharesAuthorized / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |  |
Stock options granted (in shares) |  |  |  | (2,370,313)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  | (2,084,276)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  | (7,789,220)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | [1] |  |
Stock options forfeited (in shares) |  |  |  | 1,400,349 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  | 3,318,022 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  | 2,610,812 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | [2] |  |
Stock options expired under former plans (in shares) |  |  |  | (373,043)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  | (1,157,419)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  | (576,763)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |  |
Nonvested equity stock and stock units granted (in shares) |  |  |  | (585,753)rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodDecreaseInAvailableForGrant / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | [3] | (709,611)rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodDecreaseInAvailableForGrant / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | [3] | (1,113,014)rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodDecreaseInAvailableForGrant / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | [3] |  |
Nonvested equity stock and stock units forfeited (in shares) |  |  |  | 125,560 rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodIncreaseInAvailableForGrant / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | [3] | 431,553 rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodIncreaseInAvailableForGrant / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | [3] | 284,468 rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodIncreaseInAvailableForGrant / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | [3] |  |
Shares available, at the end of the period |  |  |  | 10,724,228 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  | 2,527,428 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  | 2,729,159 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |  |
Conversion factor used to calculate the decrease in the number of shares available for grant resulting from the grant of restricted stock awards |  |  |  | 1.5 rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodDecreaseInAvailableForGrantForEveryGrant / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |  |  |  |  |  |
Conversion factor used to calculate the increase in the number of shares available for grant resulting from the forfeiture of restricted stock awards |  |  |  | 1.5 rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodIncreaseInAvailableForGrantForEveryForfeiture / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |  |  |  |  |  |
[1] | Amount includes 2,840,986 shares that were granted from the stock option exchange program (discussed below).
[2] | Amount excludes 6,449,255 shares that were surrendered from the stock option exchange program (discussed below) as the shares are no longer available for grant.
[3] | For purposes of determining the number of shares available for grant under the 2006 Plan against the maximum number of shares authorized, each restricted stock granted reduces the number of shares available for grant by 1.5 shares and each restricted stock forfeited increases shares available for grant by 1.5 shares.

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- Definition Minimum Contractual Term of Options Granted in Stock Option Exchange Program + References No definition available. + Details
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- Definition The additional maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References No definition available. + Details
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- Definition Represents the increase in number of shares available for grant under the stock incentive plans, which is based on a factor of 1.5 for every restricted stock award forfeited for the period. + References No definition available. + Details
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- Definition For purposes of determining the number of shares available for grant under the 2006 Equity Incentive Plan, represents the multiplier by which the number of shares available for grant will increase, for every restricted stock award forfeited. + References No definition available. + Details
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- Definition Represents the decrease in number of shares available for grant under the stock incentive plans, which is based on a factor of 1.5 for every restricted stock award granted for the period. + References No definition available. + Details
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- Definition For purposes of determining the number of shares available for grant under the 2006 Equity Incentive Plan, represents the multiplier by which the number of shares available for grant will decrease, for every restricted stock award granted. + References No definition available. + Details
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- Definition The number of shares under options that were surrendered during the reporting period as a result of Stock Option Exchange Program. + References No definition available. + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition An excess of the fair value of the modified award over the fair value of the award immediately before the modification. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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