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v3.20.2

Stockholders' Equity (Details) - shares | Jun. 30, 2020 | Jan. 21, 2015
--- | --- | ---
Share repurchase program |  |
Stock repurchase program, number of shares authorized to be repurchased |  | 20,000,000.0
Stock repurchase program, remaining number of shares authorized to be repurchased | 3,600,000 |

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | rmbs_StockRepurchaseProgramAbstract
Namespace Prefix: | rmbs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant