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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	$ 72,040us-gaap_SalesRevenueNet	$ 69,712us-gaap_SalesRevenueNet	$ 76,518us-gaap_SalesRevenueNet	$ 78,288us-gaap_SalesRevenueNet	$ 73,422us-gaap_SalesRevenueNet	$ 73,294us-gaap_SalesRevenueNet	$ 57,919us-gaap_SalesRevenueNet	$ 66,866us-gaap_SalesRevenueNet	$ 296,558us-gaap_SalesRevenueNet	$ 271,501us-gaap_SalesRevenueNet	$ 234,051us-gaap_SalesRevenueNet
Segment operating expenses									102,530rmbs_OperatingExpensesSegment	97,451rmbs_OperatingExpensesSegment	94,007rmbs_OperatingExpensesSegment
Segment operating income (loss)									194,028rmbs_SegmentOperatingIncomeLoss	174,050rmbs_SegmentOperatingIncomeLoss	140,044rmbs_SegmentOperatingIncomeLoss
Reconciling items									(118,682)rmbs_Segmentreconcilingitems	(151,586)rmbs_Segmentreconcilingitems	(230,478)rmbs_Segmentreconcilingitems
Operating income (loss)	17,585us-gaap_OperatingIncomeLoss	14,468us-gaap_OperatingIncomeLoss	20,104us-gaap_OperatingIncomeLoss	23,189us-gaap_OperatingIncomeLoss	6,214us-gaap_OperatingIncomeLoss	9,065us-gaap_OperatingIncomeLoss	5,744us-gaap_OperatingIncomeLoss	1,441us-gaap_OperatingIncomeLoss	75,346us-gaap_OperatingIncomeLoss	22,464us-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									50,250us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	(12,017)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	(117,885)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
MID
Financial information of business segments
Revenue									226,303us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember	232,040us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember	215,047us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember
Segment operating expenses									40,816rmbs_OperatingExpensesSegment / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember	34,823rmbs_OperatingExpensesSegment / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember	39,537rmbs_OperatingExpensesSegment / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember
Segment operating income (loss)									185,487rmbs_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember	197,217rmbs_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember	175,510rmbs_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember
CRI
Financial information of business segments
Revenue									49,330us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember	32,625us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember	17,808us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember
Segment operating expenses									27,608rmbs_OperatingExpensesSegment / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember	20,322rmbs_OperatingExpensesSegment / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember	11,418rmbs_OperatingExpensesSegment / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember
Segment operating income (loss)									21,722rmbs_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember	12,303rmbs_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember	6,390rmbs_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember
Other
Financial information of business segments
Revenue									20,925us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	6,836us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	1,196us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Segment operating expenses									34,106rmbs_OperatingExpensesSegment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	42,306rmbs_OperatingExpensesSegment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	43,052rmbs_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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Total operating income loss for reporting segments.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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