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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

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

6,500,000rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalNumberOfSharesAuthorized

6,500,000rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalNumberOfSharesAuthorized

Stock Compensation Plan [Member]

Shares available for grant

Increase in shares approved for issuance

10,000,000rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember

Shares available, at the end of the period

10,724,228us-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)

1,400,349us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember

3,318,022us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember

2,610,812us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember

Options granted (in dollars per share)

$ 9.63us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember

$ 6.09us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember

$ 5.81us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember

Options surrendered in stock option exchange program

6,449,255rmbs_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

$ 1.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= rmbs_StockOptionExchangeProgramMember

Unrecognized compensation cost of original options

$ 19.9rmbs_EmployeeServiceShareBasedCompensationNonVestedAwardsCompensationCostBeforeIncrementalCompensationExpenseNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= rmbs_StockOptionExchangeProgramMember

Options granted (in dollars per share)

$ 5.63us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= rmbs_StockOptionExchangeProgramMember

Options surrendered in stock option exchange program

6,449,255rmbs_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

2,527,428us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember

2,729,159us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember

2,812,876us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember

Increase in shares approved for issuance

10,000,000rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember

6,500,000rmbs_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)

1,400,349us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember

3,318,022us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember

2,610,812us-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)

125,560rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodIncreaseInAvailableForGrant
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember

^[3]

431,553rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodIncreaseInAvailableForGrant
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember

^[3]

284,468rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodIncreaseInAvailableForGrant
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember

^[3]

Shares available, at the end of the period

10,724,228us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember

2,527,428us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember

2,729,159us-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

1.5rmbs_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

1.5rmbs_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.

X

- Definition

Represents the unrecognized cost of original options surrendered in stock option exchange program.

+ References

No definition available.

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- Definition

Minimum Contractual Term of Options Granted in Stock Option Exchange Program

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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.

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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.

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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.

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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.

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X

- 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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X

- Details

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X

- 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.

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X

- 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

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

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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.

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X

- 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.

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X

- Definition

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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-Publisher FASB

-Name Accounting Standards Codification

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-Subparagraph (c)(1)(iv)(4)

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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

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- Definition

Net number of share options (or share units) granted during the period.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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-Paragraph 2

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X

- Definition

An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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X

- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

+ Details

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X

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