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Summary of Significant Accounting Policies (Details) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Weighted Average Number of Shares Outstanding, Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 115,024 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 114,523 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 114,116 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 113,590 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 113,217 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 112,640 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 112,183 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 111,599 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 114,318 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 112,415 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 110,769 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Financial Statement Presentation |  |  |  |  |  |  |  |  |  |  |
Maximum ownership percentage |  |  |  |  |  |  |  |  | 20.00%rmbs_CostMethodInvestmentMaximumOwnershipPercentage |  |
Royalty Revenue |  |  |  |  |  |  |  |  |  |  |
Number of types of royalty revenue streams |  |  |  |  |  |  |  |  | 2 rmbs_RevenueRecognitionNumberOfTypesOfRoyaltyRevenue |  |
Stock-Based Compensation and Equity Incentive Plans |  |  |  |  |  |  |  |  |  |  |
Discount from the fair market value (as a percent) |  |  |  |  |  |  |  |  | 15.00%rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceSpecificDate |  |
Cash and Cash Equivalents |  |  |  |  |  |  |  |  |  |  |
Maximum original maturity of cash equivalents (in months) |  |  |  |  |  |  |  |  | 3 months |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Useful life (in years) |  |  |  |  |  |  |  |  | 1 year | 1 year |
Maximum |  |  |  |  |  |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Useful life (in years) |  |  |  |  |  |  |  |  | 10 years | 10 years |

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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