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v3.25.3

Marketable Securities - Additional Information (Details) | 9 Months Ended
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Sep. 30, 2025
Debt Securities, Available-for-Sale [Abstract] |
Maximum maturity period of available-for-sale securities (in years) | 3 years

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- Definition Represents the maximum maturity period of securities invested by the entity. + References No definition available. + Details
Name: | rmbs_MaximumMaturityPeriodAvailableForSaleSecurities
Namespace Prefix: | rmbs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration