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Settlement Agreement with Samsung (Details) (USD $) | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2011 | Mar. 31, 2011 installment | Mar. 31, 2010 | Dec. 31, 2012 | Jul. 20, 2011 | Jan. 19, 2010
Settlement Agreement with Samsung |  |  |  |  |  |
Number of installments for litigation settlement proceeds, due to settlement agreement with Samsung |  | 2 |  |  |  |
Litigation settlement payment amount for each installment payment |  | $ 200,000,000 |  |  |  |
Quarterly License fee agreed to be paid by Samsung |  |  |  |  |  | 25,000,000
Period of non-exclusive rights to certain patents (in years) |  |  |  |  |  | 5 years
Issuance of common stock due to the settlement with Samsung (in shares) |  | 9,600,000 | 9,600,000 |  |  |
Amount expected to be paid by Samsung |  |  |  |  |  | 900,000,000
Number of years over which Samsung is required to make payment (in years) |  |  |  |  |  | 5 years
Fixed amount to be received quarterly from Samsung during 2010 and the first two quarters of 2011 |  |  |  |  |  | 25,000,000
Base amount to be received quarterly from Samsung and to be adjusted up or down from the third quarter of 2011 to the fourth quarter of 2014 |  |  |  |  |  | 25,000,000
Minimum adjusted amount to be received quarterly from Samsung from the third quarter of 2011 |  |  |  |  |  | 10,000,000
Maximum adjusted amount to be received quarterly from Samsung from the third quarter of 2011 |  |  |  |  |  | 40,000,000
Original Issue price of shares under stock purchase agreement with Samsung (in dollars per share) |  |  |  |  |  | $ 20.885
Settlement agreement shares as a percentage of total shares |  |  |  |  |  | 8.30%
Period after the date of Stock Purchase Agreement (in months) |  |  |  |  |  | 18 months
Extended period after the date of Stock Purchase Agreement (in months) |  |  |  |  |  | 19 months
Maximum number of shares elected to be put back by the Samsung |  |  |  |  |  | 4,800,000
Maximum aggregate purchase price |  |  |  |  |  | 100,000,000
Actual number of shares put back due to the settlement agreement with Samsung |  |  |  |  | 4,800,000 |
Actual value of shares put back |  |  |  |  | 100,000,000 |
Amount paid for actual value of shares put back | 100,000,000 |  |  |  |  |
Prohibited period for transfer of shares by Samsung (in months) |  |  |  |  |  | 18 months
Prohibited period to acquire additional shares by Samsung ( in months) |  |  |  |  |  | 18 months
Minimum percentage of shares to be held by Samsung to prevent termination of voting agreement |  |  |  |  |  | 3.00%
Remaining balance to be received |  |  |  | 200,000,000 |  |
Approximate proceeds under License Agreement (per quarter), due to Settlement Agreement with Samsung |  |  |  | $ 25,000,000 |  |

X
- Definition Represents the actual number of shares put back to the entity under the stock purchase agreement within 30 days. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition Represents the actual value for the shares under the put back facility of the stock purchase agreement within 30 days. + References No definition available. + Details
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Namespace Prefix: | rmbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Total Number of new stocks including Common Stocks and Contingently Redeemable Common Stocks issued during the period due to Samsung Settlement. + References No definition available. + Details
Name: | rmbs_AllStocksIssuedDuringPeriodSamsungSettlementRelated
Namespace Prefix: | rmbs_
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Balance Type: | na
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- Definition Cash amount for each installment payment during the current period. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Represents the maximum aggregate purchase price of shares elected to be put back to the Entity, by the Samsung under the Stock Purchase Agreement. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Represents the maximum adjusted amount under the license agreement for each quarter from the third quarter of 2011 to the fourth quarter of 2014. + References No definition available. + Details
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- Definition Represents the minimum adjusted amount under the license agreement for each quarter from the third quarter of 2011 to the fourth quarter of 2014. + References No definition available. + Details
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- Definition Represents the amount agreed to be paid per quarter by Samsung under Semiconductor Patent License Agreement. + References No definition available. + Details
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Balance Type: | debit
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- Definition The base amount to be adjusted up or down and to be received each quarter from Samsung, under the License Agreement from the third quarter of 2011 to the fourth quarter of 2014. + References No definition available. + Details
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- Definition Represents the fixed amount to be received for each quarter from Samsung, under the License Agreement during 2010 and the first two quarters of 2011. + References No definition available. + Details
Name: | rmbs_LicenseAgreementFixedAmountToBeReceivedQuarterly
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents future quarterly payments required to be made by Samsung under the License Agreement based on the estimates at the balance sheet date. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Represents the number of years over which Samsung is required to make payment under the License Agreement. + References No definition available. + Details
Name: | rmbs_LicenseAgreementPeriodOverWhichAmountToBeReceivedFromSamsung
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the maximum number of shares elected to be put back to the entity, by Samsung under the Stock Purchase Agreement. + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the minimum percentage of shares issued under the settlement agreement as a percentage of total shares to prevent the voting agreement under the Stock Purchase Agreement from being terminated. + References No definition available. + Details
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Namespace Prefix: | rmbs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the amount that the Company paid to redeem the Contigently Redeemable Common Stock during the period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Represents the period over which Samsung needs to make periodic payments under the license agreement (in years). + References No definition available. + Details
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- Definition Represents the period after the date of the Stock Purchase Agreement for which Samsung is not allowed to acquire additional shares + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
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- Definition Represents the period after the date of the Stock Purchase Agreement for which Samsung is not allowed to transfer shares. + References No definition available. + Details
Name: | rmbs_ProhibitedPeriodToTransferShares
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the estimated fair value of the settlement agreement which Samsung has agreed to pay subject to adjustments per the terms of the License Agreement. + References No definition available. + Details
Name: | rmbs_SettlementAgreementEstimatedFairValueTotal
Namespace Prefix: | rmbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the number of installments in which litigation settlement payments were made by Samsung. + References No definition available. + Details
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Namespace Prefix: | rmbs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the shares issued under the settlement agreement as a percentage of the entity's total shares. + References No definition available. + Details
Name: | rmbs_SettlementAgreementSharesAsPercentageOfTotalShares
Namespace Prefix: | rmbs_
Data Type: | num:percentItemType
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- Definition Represents the balance at the end of the period under the settlement agreement which Samsung has agreed to pay. + References No definition available. + Details
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Namespace Prefix: | rmbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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- Definition The original issue price of shares, under stock purchase agreement with Samsung. + References No definition available. + Details
Name: | rmbs_StockIssuedDuringPeriodAveragePricePerShare
Namespace Prefix: | rmbs_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the end period after the date of stock purchase agreement, by which Samsung can exercise its put right (in months). + References No definition available. + Details
Name: | rmbs_ValidityOfPutBackRightEndPeriod
Namespace Prefix: | rmbs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the start period after the date of stock purchase agreement, from which Samsung can exercise its put right (in months). + References No definition available. + Details
Name: | rmbs_ValidityOfPutBackRightStartPeriod
Namespace Prefix: | rmbs_
Data Type: | xbrli:durationItemType
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Period Type: | instant