XML 69 R68.htm IDEA: XBRL DOCUMENT v2.4.1.9

Commitments and Contingencies (Details) (USD $)	3 Months Ended			12 Months Ended			0 Months Ended			3 Months Ended	0 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 29, 2009	Aug. 16, 2013	Dec. 15, 2009 sqft	Sep. 30, 2011	Feb. 01, 2012	Jul. 10, 2009	Jan. 31, 2013 sqft	Nov. 04, 2011 sqft	Sep. 29, 2012	Sep. 29, 2011 sqft	Mar. 08, 2010 sqft
Lease Commitments
Interest expense related to imputed financing obligation				$ 4,500,000rmbs_FinancingExpenseFromLeaseFacilities	$ 4,400,000rmbs_FinancingExpenseFromLeaseFacilities	$ 4,100,000rmbs_FinancingExpenseFromLeaseFacilities
Current and Long Term, Imputed Financing Obligation	39,700,000rmbs_CurrentAndLongTermImputedFinancingObligation			39,500,000rmbs_CurrentAndLongTermImputedFinancingObligation	39,700,000rmbs_CurrentAndLongTermImputedFinancingObligation
Capitalized property plant and equipment	40,320,000rmbs_PropertyPlantAndEquipmentCostCapitalizationAmount			40,300,000rmbs_PropertyPlantAndEquipmentCostCapitalizationAmount	40,320,000rmbs_PropertyPlantAndEquipmentCostCapitalizationAmount
Restructuring charges	2,200,000us-gaap_RestructuringCharges	1,100,000us-gaap_RestructuringCharges	2,200,000us-gaap_RestructuringCharges	39,000us-gaap_RestructuringCharges	5,546,000us-gaap_RestructuringCharges	7,301,000us-gaap_RestructuringCharges
Unamortized discount	36,824,000us-gaap_DebtInstrumentUnamortizedDiscount			22,911,000us-gaap_DebtInstrumentUnamortizedDiscount	36,824,000us-gaap_DebtInstrumentUnamortizedDiscount
Convertible notes
Lease Commitments
Face Value	310,500,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember			138,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	310,500,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember
Convertible notes | 5% Convertible Senior Notes due 2014
Lease Commitments
Face Value	172,500,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember			0us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	172,500,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember		150,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember					22,500,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember
Unamortized discount	8,453,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember			0us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	8,453,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember
Debt discount amortization period							5 years
Convertible notes | 1.125% Convertible Senior Notes due 2018
Lease Commitments
Face Value	138,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember			138,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	138,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember			138,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember
Unamortized discount	28,371,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember			22,911,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	28,371,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember
Debt discount amortization period				44 months				5 years
Convertible Senior Notes [Member] | 5% Convertible Senior Notes due 2014
Lease Commitments
Repayments of Debt				172,500,000us-gaap_RepaymentsOfDebt / us-gaap_DebtInstrumentAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member / us-gaap_LongtermDebtTypeAxis = rmbs_ConvertibleSeniorNotesMember
Facility Closing [Member]
Lease Commitments
Restructuring charges					2,000,000us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Sunnyvale Facility, Original agreement
Lease Commitments
Number of options									2rmbs_OperatingLeaseCommitmentNumberOfOptionToExtendLeaseAgreement / rmbs_OperatingLeaseCommitmentAxis = rmbs_MtspellcMember
Period for extension of lease (in months)									60 months
Total reimbursement receivable under lease agreement									9,100,000rmbs_ReimbursementUnderLeasesToBeReceived / rmbs_OperatingLeaseCommitmentAxis = rmbs_MtspellcMember
Total space under lease (in square feet)									125,000us-gaap_AreaOfRealEstateProperty / rmbs_OperatingLeaseCommitmentAxis = rmbs_MtspellcMember
Sunnyvale Facility, First Amended
Lease Commitments
Total reimbursement receivable under lease agreement														1,700,000rmbs_ReimbursementUnderLeasesToBeReceived / rmbs_OperatingLeaseCommitmentAxis = rmbs_MtspellcAmendedMember
Total space under lease (in square feet)													31,000us-gaap_AreaOfRealEstateProperty / rmbs_OperatingLeaseCommitmentAxis = rmbs_MtspellcAmendedMember	31,000us-gaap_AreaOfRealEstateProperty / rmbs_OperatingLeaseCommitmentAxis = rmbs_MtspellcAmendedMember
Sunnyvale Facility, Second Amended
Lease Commitments
Total reimbursement receivable under lease agreement															$ 1,500,000rmbs_ReimbursementUnderLeasesToBeReceived / rmbs_OperatingLeaseCommitmentAxis = rmbs_SunnyvaleFacilitySecondAmendedMember
Ohio Facility
Lease Commitments
Period for extension of lease (in months)										60 months
Total space under lease (in square feet)																51,000us-gaap_AreaOfRealEstateProperty / rmbs_OperatingLeaseCommitmentAxis = rmbs_OhioFacilityMember
Fogg-Brecksville Development Co., Original
Lease Commitments
Total space under lease (in square feet)																	25,000us-gaap_AreaOfRealEstateProperty / rmbs_OperatingLeaseCommitmentAxis = rmbs_FoggBrecksvilleDevelopmentMember
San Francisco Facility
Lease Commitments
Lease term (in months)											75 months
Total space under lease (in square feet)														26,000us-gaap_AreaOfRealEstateProperty / rmbs_OperatingLeaseCommitmentAxis = rmbs_MetropolitanLifeInsuranceMember

X

- Definition

The unamortized amount of current and long-term liabilities that an Entity assumes in consideration for the estimated fair value of the Entity's share of buildings in the build out of leased facilities plus any tenant improvement allowance received from landlords. As the Entity retains sufficient continuing involvement following the completion of construction, for accounting purposes, the Entity is treated as the owner of the leased facilities and to record an imputed financing obligation for its obligation to the legal owners.

+ References

No definition available.

+ Details

Name:	rmbs_CurrentAndLongTermImputedFinancingObligation
Namespace Prefix:	rmbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the interest expense in connection with the imputed financing obligation during the period.

+ References

No definition available.

+ Details

Name:	rmbs_FinancingExpenseFromLeaseFacilities
Namespace Prefix:	rmbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Specifies the time period covered by the lease arrangement.

+ References

No definition available.

+ Details

Name:	rmbs_LeaseCommitmentTimePeriod
Namespace Prefix:	rmbs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	rmbs_OperatingLeaseCommitmentLineItems
Namespace Prefix:	rmbs_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Operating Lease Commitment Number of Extended Months under Options

+ References

No definition available.

+ Details

Name:	rmbs_OperatingLeaseCommitmentNumberofExtendedMonthsunderOptions
Namespace Prefix:	rmbs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of options to extend the lease.

+ References

No definition available.

+ Details

Name:	rmbs_OperatingLeaseCommitmentNumberOfOptionToExtendLeaseAgreement
Namespace Prefix:	rmbs_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the total capitalized amount of property, plant and equipment which was based on the estimated fair value of the portion of the unfinished leased building along with a corresponding financing obligation for the same amount.

+ References

No definition available.

+ Details

Name:	rmbs_PropertyPlantAndEquipmentCostCapitalizationAmount
Namespace Prefix:	rmbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the total amount that the landlord has agreed to reimburse the reporting entity pursuant to the terms of the lease agreement.

+ References

No definition available.

+ Details

Name:	rmbs_ReimbursementUnderLeasesToBeReceived
Namespace Prefix:	rmbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

+ Details

Name:	us-gaap_DebtInstrumentConvertibleRemainingDiscountAmortizationPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

+ Details

Name:	us-gaap_RepaymentsOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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:	rmbs_OperatingLeaseCommitmentAxis=rmbs_FoggBrecksvilleDevelopmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	rmbs_OperatingLeaseCommitmentAxis=rmbs_MetropolitanLifeInsuranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	rmbs_OperatingLeaseCommitmentAxis=rmbs_MtspellcAmendedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	rmbs_OperatingLeaseCommitmentAxis=rmbs_MtspellcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	rmbs_OperatingLeaseCommitmentAxis=rmbs_OhioFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	rmbs_OperatingLeaseCommitmentAxis=rmbs_SunnyvaleFacilitySecondAmendedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=rmbs_ConvertibleSeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleNotesPayableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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