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Litigation and Asserted Claims (Details) (USD $) In Thousands, unless otherwise specified |  |  |  | 1 Months Ended |  | 3 Months Ended |  |  |  |  | 1 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Hynix Litigation - U.S. District Court of the Northern District of California | Jan. 31, 2006 Micron Litigation - U.S. District Court of the Northern District of California Patent | Mar. 31, 2013 Micron Litigation - European Patent Infringement Cases | Sep. 30, 2012 Broadcom, Freescale, LSI, MediaTek, and STMicroelectronics Litigation Item | Mar. 31, 2013 Superior Court of California for the County of San Francisco | May 05, 2004 Superior Court of California for the County of San Francisco Item | Jan. 29, 2013 Micron Litigation - Superior Court of California for County of San Francisco | Jan. 29, 2013 Hynix Litigation - Superior Court of California for County of San Francisco | Mar. 01, 2007 Stock Option Investigation Related Claims | Jan. 31, 2013 Micron Litigation - U.S. District Court in Delaware: Case No. 00-792-SLR | Aug. 31, 2000 Micron Litigation - U.S. District Court in Delaware: Case No. 00-792-SLR Patent
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued litigation expenses | $ 10,256 | $ 9,822 | $ 8,100 |  |  |  | $ 900 |  | $ 520 | $ 350 |  |  |
Number of patent claims invalid |  |  |  |  |  |  |  |  |  |  |  |  | 8
Number of patent claims infringed or in suit |  |  |  | 14 |  |  |  |  |  |  |  |  | 12
Number of days for directing judgement by the court |  |  |  |  |  |  |  |  |  |  |  | 30 days |
Number of appeals |  |  |  |  | 2 |  |  |  |  |  |  |  |
Number of Samsung-related entities added as defendants |  |  |  |  |  |  |  | 3 |  |  |  |  |
Number of shareholders whose actions were filed |  |  |  |  |  |  |  |  |  |  | 2 |  |
Number of respondents |  |  |  |  |  | 1 |  |  |  |  |  |  |

X
- Definition Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to litigation services. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References No definition available. + Details
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Namespace Prefix: | rmbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Loss Contingency, Number of Days for Directing Judgement by the Court + References No definition available. + Details
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Namespace Prefix: | rmbs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of invalid patent claims. + References No definition available. + Details
Name: | rmbs_LossContingencyPatentClaimsInvalid
Namespace Prefix: | rmbs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of patents in suit or infringed. + References No definition available. + Details
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Namespace Prefix: | rmbs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of entities added as defendants. + References No definition available. + Details
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Namespace Prefix: | rmbs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of respondents. + 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 number of shareholders whose derivative actions were filed. + References No definition available. + Details
Name: | rmbs_NumberOfShareholdersWhoseActionsFiled
Namespace Prefix: | rmbs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of pending claims pertaining to a loss contingency accrual as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9, 10, 11, 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant