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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			1.5rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsToDeriveSharesAvailableForGrantNumerator
Denominator in conversion factor used to determine shares available for grant			1rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsToDeriveSharesAvailableForGrantDenominator
Increase in shares approved for issuance	6,500,000rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalNumberOfSharesAuthorized	6,500,000rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalNumberOfSharesAuthorized
Number of shares reserved for issuance under the 2006 stock option plan			31,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized		8,400,000us-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				10,000,000rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember

X

- 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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X

- 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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X

- 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

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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

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