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Segments and Major Customers (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Financial information of business segments |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 72,040 us-gaap_SalesRevenueNet | $ 69,712 us-gaap_SalesRevenueNet | $ 76,518 us-gaap_SalesRevenueNet | $ 78,288 us-gaap_SalesRevenueNet | $ 73,422 us-gaap_SalesRevenueNet | $ 73,294 us-gaap_SalesRevenueNet | $ 57,919 us-gaap_SalesRevenueNet | $ 66,866 us-gaap_SalesRevenueNet | $ 296,558 us-gaap_SalesRevenueNet | $ 271,501 us-gaap_SalesRevenueNet | $ 234,051 us-gaap_SalesRevenueNet
Segment operating expenses |  |  |  |  |  |  |  |  | 102,530 rmbs_OperatingExpensesSegment | 97,451 rmbs_OperatingExpensesSegment | 94,007 rmbs_OperatingExpensesSegment
Segment operating income (loss) |  |  |  |  |  |  |  |  | 194,028 rmbs_SegmentOperatingIncomeLoss | 174,050 rmbs_SegmentOperatingIncomeLoss | 140,044 rmbs_SegmentOperatingIncomeLoss
Reconciling items |  |  |  |  |  |  |  |  | (118,682)rmbs_Segmentreconcilingitems | (151,586)rmbs_Segmentreconcilingitems | (230,478)rmbs_Segmentreconcilingitems
Operating income (loss) | 17,585 us-gaap_OperatingIncomeLoss | 14,468 us-gaap_OperatingIncomeLoss | 20,104 us-gaap_OperatingIncomeLoss | 23,189 us-gaap_OperatingIncomeLoss | 6,214 us-gaap_OperatingIncomeLoss | 9,065 us-gaap_OperatingIncomeLoss | 5,744 us-gaap_OperatingIncomeLoss | 1,441 us-gaap_OperatingIncomeLoss | 75,346 us-gaap_OperatingIncomeLoss | 22,464 us-gaap_OperatingIncomeLoss | (90,434)us-gaap_OperatingIncomeLoss
Interest and other income (expense), net |  |  |  |  |  |  |  |  | (25,096)us-gaap_NonoperatingIncomeExpense | (34,481)us-gaap_NonoperatingIncomeExpense | (27,451)us-gaap_NonoperatingIncomeExpense
Income before income taxes |  |  |  |  |  |  |  |  | 50,250 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (12,017)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (117,885)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
MID |  |  |  |  |  |  |  |  |  |  |
Financial information of business segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 226,303 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember | 232,040 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember | 215,047 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember
Segment operating expenses |  |  |  |  |  |  |  |  | 40,816 rmbs_OperatingExpensesSegment / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember | 34,823 rmbs_OperatingExpensesSegment / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember | 39,537 rmbs_OperatingExpensesSegment / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember
Segment operating income (loss) |  |  |  |  |  |  |  |  | 185,487 rmbs_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember | 197,217 rmbs_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember | 175,510 rmbs_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember
CRI |  |  |  |  |  |  |  |  |  |  |
Financial information of business segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 49,330 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember | 32,625 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember | 17,808 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember
Segment operating expenses |  |  |  |  |  |  |  |  | 27,608 rmbs_OperatingExpensesSegment / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember | 20,322 rmbs_OperatingExpensesSegment / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember | 11,418 rmbs_OperatingExpensesSegment / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember
Segment operating income (loss) |  |  |  |  |  |  |  |  | 21,722 rmbs_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember | 12,303 rmbs_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember | 6,390 rmbs_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember
Other |  |  |  |  |  |  |  |  |  |  |
Financial information of business segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 20,925 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 6,836 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 1,196 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Segment operating expenses |  |  |  |  |  |  |  |  | 34,106 rmbs_OperatingExpensesSegment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 42,306 rmbs_OperatingExpensesSegment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 43,052 rmbs_OperatingExpensesSegment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Segment operating income (loss) |  |  |  |  |  |  |  |  | $ (13,181)rmbs_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | $ (35,470)rmbs_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | $ (41,856)rmbs_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember

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