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Equity Incentive Plans and Stock-Based Compensation (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 30, 2009 | Jun. 30, 2012 | Dec. 31, 2014 denominator numerator | Apr. 24, 2014 | Mar. 31, 2006
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Tenure of award (in years) |  |  | 10 years |  |
Numerator in conversion factor used to determine shares available for grant |  |  | 1.5 rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsToDeriveSharesAvailableForGrantNumerator |  |
Denominator in conversion factor used to determine shares available for grant |  |  | 1 rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsToDeriveSharesAvailableForGrantDenominator |  |
Increase in shares approved for issuance | 6,500,000 rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalNumberOfSharesAuthorized | 6,500,000 rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalNumberOfSharesAuthorized |  |  |
Number of shares reserved for issuance under the 2006 stock option plan |  |  | 31,400,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized |  | 8,400,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Option One |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Requisite service period (in months) |  |  | 60 months |  |
Option Two |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Requisite service period (in months) |  |  | 48 months |  |
Stock Compensation Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Increase in shares approved for issuance |  |  |  | 10,000,000 rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember |

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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 Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period + References No definition available. + Details
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- Definition Represents the denominator in the conversion factor used to determine the change in remaining shares available for grant. + References No definition available. + Details
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- Definition Represents the numerator in the conversion factor used to determine the change in remaining shares available for grant. + References No definition available. + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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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- Details
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- Definition The 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 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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