XML 32 R77.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Restructuring Charges (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges | $ 2,200,000 us-gaap_RestructuringCharges | $ 1,100,000 us-gaap_RestructuringCharges | $ 2,200,000 us-gaap_RestructuringCharges | $ 39,000 us-gaap_RestructuringCharges | $ 5,546,000 us-gaap_RestructuringCharges | $ 7,301,000 us-gaap_RestructuringCharges
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring charges | 2,200,000 us-gaap_RestructuringCharges | 1,100,000 us-gaap_RestructuringCharges | 2,200,000 us-gaap_RestructuringCharges | 39,000 us-gaap_RestructuringCharges | 5,546,000 us-gaap_RestructuringCharges | 7,301,000 us-gaap_RestructuringCharges
Facility Closing [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  |  | 2,000,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring charges |  |  |  |  | 2,000,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember |
2012 Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  | 9,400,000 us-gaap_RestructuringAndRelatedCostCostIncurredToDate1 / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember |  |
Company estimate of the aggregate restructuring cost |  |  |  | 10,000,000 us-gaap_RestructuringAndRelatedCostExpectedCost1 / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember |  |
Restructuring charges |  |  |  |  | 2,096,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | 7,301,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Balance at December 31, 2011 |  |  | 906,000 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | 84,000 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | 906,000 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember
Restructuring charges |  |  |  |  | 2,096,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | 7,301,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember
Payments for Restructuring |  |  |  | (84,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | (2,265,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | (6,395,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember
Non-cash settlements |  |  |  |  | (653,000)us-gaap_RestructuringReserveSettledWithoutCash1 / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember |
Balance at December 31, 2012 | 84,000 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember |  |  | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | 84,000 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | 906,000 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember
2012 Plan | Facility Closing [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  |  | 1,960,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | 0 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Balance at December 31, 2011 |  |  | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember
Restructuring charges |  |  |  |  | 1,960,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | 0 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember
Payments for Restructuring |  |  |  | 0 us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | (1,307,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | 0 us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember
Non-cash settlements |  |  |  |  | (653,000)us-gaap_RestructuringReserveSettledWithoutCash1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember |
Balance at December 31, 2012 | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember |  |  | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember
2012 Plan | Employee Severance [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  |  | 136,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | 7,301,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Balance at December 31, 2011 |  |  | 906,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | 84,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | 906,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember
Restructuring charges |  |  |  |  | 136,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | 7,301,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember
Payments for Restructuring |  |  |  | (84,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | (958,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | (6,395,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember
Non-cash settlements |  |  |  |  | 0 us-gaap_RestructuringReserveSettledWithoutCash1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember |
Balance at December 31, 2012 | 84,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember |  |  | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | 84,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember | 906,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember
2012 Plan | ESD Segment [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | 3,400,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember / us-gaap_StatementBusinessSegmentsAxis = rmbs_ESDSegmentMember
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | 3,400,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember / us-gaap_StatementBusinessSegmentsAxis = rmbs_ESDSegmentMember
2012 Plan | MID |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | 700,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | 700,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember
2012 Plan | Other |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | 100,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | 100,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
2012 Plan | Corporate |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | 3,100,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | 3,100,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandTwelvePlanMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
2013 Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  | 39,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember | 3,450,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Balance at December 31, 2011 |  |  | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember | 1,865,000 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember |
Restructuring charges |  |  |  | 39,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember | 3,450,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember |
Payments for Restructuring |  |  |  | (1,904,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember | (1,585,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember |
Balance at December 31, 2012 | 1,865,000 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember |  |  | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember | 1,865,000 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember |
2013 Plan | Facility Closing [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  | 0 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember | 195,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Balance at December 31, 2011 |  |  | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember | 133,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember |
Restructuring charges |  |  |  | 0 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember | 195,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember |
Payments for Restructuring |  |  |  | (133,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember | (62,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember |
Balance at December 31, 2012 | 133,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember |  |  | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember | 133,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember |
2013 Plan | Employee Severance [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  | 39,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember | 3,255,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Balance at December 31, 2011 |  |  | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember | 1,732,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember |
Restructuring charges |  |  |  | 39,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember | 3,255,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember |
Payments for Restructuring |  |  |  | (1,771,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember | (1,523,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember |
Balance at December 31, 2012 | 1,732,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember |  |  | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember | 1,732,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember |
2013 Plan | ESD Segment [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  |  | 2,400,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember / us-gaap_StatementBusinessSegmentsAxis = rmbs_ESDSegmentMember |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring charges |  |  |  |  | 2,400,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember / us-gaap_StatementBusinessSegmentsAxis = rmbs_ESDSegmentMember |
2013 Plan | MID |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  |  | 100,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring charges |  |  |  |  | 100,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember |
2013 Plan | Other |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  |  | 900,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring charges |  |  |  |  | 900,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
2013 Plan | Minimum |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Company estimate of the aggregate restructuring cost |  |  |  | 3,000,000 us-gaap_RestructuringAndRelatedCostExpectedCost1 / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember |  |
2013 Plan | Maximum |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Company estimate of the aggregate restructuring cost |  |  |  | $ 4,000,000 us-gaap_RestructuringAndRelatedCostExpectedCost1 / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_RestructuringPlanAxis = rmbs_TwoThousandThirteenRestructuringPlanMember |  |

X
- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_PaymentsForRestructuring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of costs incurred to date for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
Name: | us-gaap_RestructuringAndRelatedCostCostIncurredToDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount expected to be recognized in earnings for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
Name: | us-gaap_RestructuringAndRelatedCostExpectedCost1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
Name: | us-gaap_RestructuringCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_RestructuringCostAndReserveLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
Name: | us-gaap_RestructuringReserve
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_RestructuringReserveRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of consideration other than cash used to fully or partially settle an accrued restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
Name: | us-gaap_RestructuringReserveSettledWithoutCash1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=us-gaap_FacilityClosingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringPlanAxis=rmbs_TwoThousandThirteenRestructuringPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringPlanAxis=rmbs_TwoThousandTwelvePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |