$RMBS
RAMBUS INC Stock $rmbs

$rmbs Overview Financials Valuation SEC Filings Company Website

2019 Q1 Form 10-K Financial Statement

#000091727320000005 Filed on February 26, 2020

Income Statement

Concept	2019 Q1	2018 Q4	2018 Q3
Revenue	$48.38M	$68.56M	$59.75M
YoY Change	4.22%	-32.71%	-39.72%
Cost Of Revenue	$11.20M	$10.60M	$5.952M
YoY Change	-7.62%	-41.11%	-58.83%
Gross Profit	$37.19M	$58.00M	$53.80M
YoY Change	8.4%	-30.87%	-36.46%
Gross Profit Margin	76.86%	84.59%	90.04%
Selling, General & Admin	$26.52M	$24.80M	$24.46M
YoY Change	-12.18%	-13.89%	-8.72%
% of Gross Profit	71.32%	42.76%	45.47%
Research & Development	$40.62M	$37.40M	$43.13M
YoY Change	1.25%	-5.08%	19.16%
% of Gross Profit	109.23%	64.48%	80.17%
Depreciation & Amortization	$4.809M	$7.500M	$7.700M
YoY Change	63.46%	-46.04%	-44.2%
% of Gross Profit	12.93%	12.93%	14.31%
Operating Expenses	$68.60M	$62.20M	$67.59M
YoY Change	-2.45%	-8.93%	7.3%
Operating Profit	-$31.41M	-$4.200M	-$19.17M
YoY Change	-27.98%	-126.72%	-212.68%
Interest Expense	$2.271M	$4.000M	$3.976M
YoY Change	-48.63%	-229.03%	20.96%
% of Operating Profit
Other Income/Expense, Net	$5.142M		$4.032M
YoY Change	9.52%		-230.95%
Pretax Income	-$26.27M	-$200.0K	-$15.14M
YoY Change	-32.51%	-101.72%	-208.64%
Income Tax	$300.0K	$1.800M	$89.80M
% Of Pretax Income
Net Earnings	-$26.58M	-$2.018M	-$104.9M
YoY Change	-25.53%	-94.42%	-1463.13%
Net Earnings / Revenue	-54.93%	-2.94%	-175.54%
Basic Earnings Per Share	-$0.24		-$0.97
Diluted Earnings Per Share	-$0.24	-$18.38K	-$0.97
COMMON SHARES
Basic Shares Outstanding	109.7M shares	108.8M shares	107.9M shares
Diluted Shares Outstanding	109.7M shares	108.8M shares	107.9M shares

Balance Sheet

Concept	2019 Q1	2018 Q4	2018 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$305.9M	$277.8M	$248.2M
YoY Change	5.05%	-15.66%	35.19%
Cash & Equivalents	$143.0M	$115.9M	$134.5M
Short-Term Investments	$162.9M	$161.8M	$113.6M
Other Short-Term Assets	$16.90M	$15.70M	$14.40M
YoY Change	0.6%	38.94%	30.91%
Inventory	$8.192M	$6.772M	$6.272M
Prepaid Expenses
Receivables	$43.81M	$50.86M	$42.67M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$545.0M	$527.8M	$476.0M
YoY Change	8.62%	41.97%	90.84%
LONG-TERM ASSETS
Property, Plant & Equipment	$22.64M	$57.03M	$49.17M
YoY Change	-53.22%	5.02%	-9.0%
Goodwill	$207.8M	$207.2M	$208.1M
YoY Change	-1.67%	-1.18%	-0.57%
Intangibles	$55.51M	$59.94M	$65.41M
YoY Change	-32.38%	-34.65%	-36.21%
Long-Term Investments	$3.200M	$3.300M
YoY Change
Other Assets	$7.419M	$7.825M	$5.879M
YoY Change	64.61%	72.24%	157.51%
Total Long-Term Assets	$776.4M	$833.4M	$867.9M
YoY Change	-25.19%	60.48%	51.03%
TOTAL ASSETS
Total Short-Term Assets	$545.0M	$527.8M	$476.0M
Total Long-Term Assets	$776.4M	$833.4M	$867.9M
Total Assets	$1.321B	$1.361B	$1.344B
YoY Change	-14.17%	52.75%	63.08%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$8.274M	$7.392M	$8.572M
YoY Change	16.86%	-23.11%	22.18%
Accrued Expenses	$23.00M	$16.90M	$14.40M
YoY Change	53.33%	-1.17%	17.07%
Deferred Revenue	$15.77M	$19.37M	$12.73M
YoY Change	688.7%	6.03%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due		$0.00	$0.00
YoY Change		-100.0%	-100.0%
Total Short-Term Liabilities	$69.28M	$69.29M	$59.38M
YoY Change	-52.5%	-47.84%	-67.51%
LONG-TERM LIABILITIES
Long-Term Debt	$143.6M	$178.2M	$176.8M
YoY Change	-17.52%	3.18%	371.47%
Other Long-Term Liabilities	$22.97M	$5.287M	$18.04M
YoY Change	164.81%	592.92%	25.44%
Total Long-Term Liabilities	$22.97M	$5.287M	$18.04M
YoY Change	164.81%	592.92%	25.44%
TOTAL LIABILITIES
Total Short-Term Liabilities	$69.28M	$69.29M	$59.38M
Total Long-Term Liabilities	$22.97M	$5.287M	$18.04M
Total Liabilities	$321.5M	$349.0M	$335.7M
YoY Change	-23.56%	9.25%	43.08%
SHAREHOLDERS EQUITY
Retained Earnings	$4.500M	-$204.3M	-$202.3M
YoY Change	-99.28%	-67.89%	-65.88%
Common Stock	$1.235B	$1.227B	$1.219B
YoY Change	3.23%	1.14%	2.62%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$999.9M	$1.012B	$1.008B
YoY Change
Total Liabilities & Shareholders Equity	$1.321B	$1.361B	$1.344B
YoY Change	-14.17%	52.75%	63.08%

Cashflow Statement

Concept	2019 Q1	2018 Q4	2018 Q3
OPERATING ACTIVITIES
Net Income	-$26.58M	-$2.018M	-$104.9M
YoY Change	-25.53%	-94.42%	-1463.13%
Depreciation, Depletion And Amortization	$4.809M	$7.500M	$7.700M
YoY Change	63.46%	-46.04%	-44.2%
Cash From Operating Activities	$28.76M	$35.00M	$31.70M
YoY Change	71.2%	-41.28%	107.19%
INVESTING ACTIVITIES
Capital Expenditures	$664.0K	-$3.300M	-$2.500M
YoY Change	-60.66%	-15.38%	19.05%
Acquisitions
YoY Change
Other Investing Activities	-$800.0K	-$50.90M	-$63.70M
YoY Change	-98.77%	-50.34%
Cash From Investing Activities	-$1.493M	-$54.10M	-$66.30M
YoY Change	-97.76%	-49.2%	3215.0%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$0.00
YoY Change	-100.0%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-$170.0K	1.000M	-78.80M
YoY Change	-99.69%	-98.89%	-5353.33%
NET CHANGE
Cash From Operating Activities	$28.76M	35.00M	31.70M
Cash From Investing Activities	-$1.493M	-54.10M	-66.30M
Cash From Financing Activities	-$170.0K	1.000M	-78.80M
Net Change In Cash	$27.10M	-18.10M	-113.4M
YoY Change	-126.06%	-142.19%	-866.22%
FREE CASH FLOW
Cash From Operating Activities	$28.76M	$35.00M	$31.70M
Capital Expenditures	$664.0K	-$3.300M	-$2.500M
Free Cash Flow	$28.10M	$38.30M	$34.20M
YoY Change	85.93%	-39.69%	96.55%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Amendment Flag AmendmentFlag	false
CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0000917273
CY2018	rmbs	Maximum Maturity Period Available For Sale Securities MaximumMaturityPeriodAvailableForSaleSecurities	P3Y
CY2018	rmbs	Maximum Remaining Maturity Period Available For Sale Securities MaximumRemainingMaturityPeriodAvailableForSaleSecurities	P1Y
CY2018Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.001
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.001
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	500000000	shares
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	500000000	shares
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	109017708	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	112131352	shares
CY2018Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	109017708	shares
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	112131352	shares
CY2018Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.001
CY2019Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.001
CY2018Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2018Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2019Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2018Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2019Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2017Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	0	USD
CY2018Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	328000	USD
CY2019Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	342000	USD
CY2019	dei	Document Type DocumentType	10-K
CY2019	dei	Document Annual Report DocumentAnnualReport	true
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-12-31
CY2019	dei	Document Transition Report DocumentTransitionReport	false
CY2019	dei	Entity File Number EntityFileNumber	000-22339
CY2019	dei	Entity Registrant Name EntityRegistrantName	RAMBUS INC.
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	94-3112828
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	1050 Enterprise Way
CY2019	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 700
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	Sunnyvale
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	CA
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	94089
CY2019	dei	City Area Code CityAreaCode	408
CY2019	dei	Local Phone Number LocalPhoneNumber	462-8000
CY2019	dei	Security12b Title Security12bTitle	Common Stock, $.001 Par Value
CY2019	dei	Trading Symbol TradingSymbol	RMBS
CY2019	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2019	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2019	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2019	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2019	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2019	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2019	dei	Entity Small Business EntitySmallBusiness	false
CY2019	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2019	dei	Entity Shell Company EntityShellCompany	false
CY2019Q2	dei	Entity Public Float EntityPublicFloat	1100000000	USD
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CY2018	us-gaap	Net Income Loss NetIncomeLoss	-157957000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	-22862000	USD
CY2019	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-0.81
CY2018	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-1.46
CY2017	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-0.21
CY2019	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	-0.81
CY2018	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	-1.46
CY2017	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	-0.21
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	110948000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	108450000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	110198000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	110948000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	108450000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	110198000	shares
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-90419000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-157957000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	-22862000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	10145000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-4447000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	7798000	USD
CY2019	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	54000	USD
CY2018	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	-747000	USD
CY2017	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	613000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-80220000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-163151000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-14451000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	552782000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	-22862000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	7798000	USD
CY2017	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	613000	USD
CY2017	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	10733000	USD
CY2017	rmbs	Upfront Payment Related Fees Under Accelerated Stock Repurchase Program UpfrontPaymentRelatedFeesUnderAcceleratedStockRepurchaseProgram	50038000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	27403000	USD
CY2017	rmbs	Adjustmentsto Additional Paidin Capital Purchaseofconvertiblenotehedges AdjustmentstoAdditionalPaidinCapitalPurchaseofconvertiblenotehedges	33523000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Warrant Issued AdjustmentsToAdditionalPaidInCapitalWarrantIssued	23173000	USD
CY2017	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Change On Net Income NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome	38243000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	571584000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-157957000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-4447000	USD
CY2018	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	-747000	USD
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	4630000	USD
CY2018	rmbs	Upfront Payment Related Fees Under Accelerated Stock Repurchase Program UpfrontPaymentRelatedFeesUnderAcceleratedStockRepurchaseProgram	50033000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	21736000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	1012112000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-90419000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	10145000	USD
CY2019	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	54000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	8081000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	26476000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	970918000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-90419000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-157957000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	-22862000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	26476000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	21736000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	27403000	USD
CY2019	rmbs	Depreciationandamortizationofoperatingleasesrightofuseassets Depreciationandamortizationofoperatingleasesrightofuseassets	23507000	USD
CY2018	rmbs	Depreciationandamortizationofoperatingleasesrightofuseassets Depreciationandamortizationofoperatingleasesrightofuseassets	10745000	USD
CY2017	rmbs	Depreciationandamortizationofoperatingleasesrightofuseassets Depreciationandamortizationofoperatingleasesrightofuseassets	13275000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	17058000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	29341000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	41962000	USD
CY2019	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	6854000	USD
CY2018	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	9243000	USD
CY2017	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	7578000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-1082000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1816000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	79954000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	39535000	USD
CY2019	us-gaap	Restructuring Costs RestructuringCosts	0	USD
CY2018	us-gaap	Restructuring Costs RestructuringCosts	670000	USD
CY2017	us-gaap	Restructuring Costs RestructuringCosts	0	USD
CY2019	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	-7439000	USD
CY2018	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	0	USD
CY2017	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	0	USD
CY2019	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	0	USD
CY2018	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	1266000	USD
CY2017	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	0	USD
CY2019	us-gaap	Availableforsale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	0	USD
CY2018	us-gaap	Availableforsale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	291000	USD
CY2017	us-gaap	Availableforsale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	0	USD
CY2019	us-gaap	Gain Loss On Sale Of Equity Investments GainLossOnSaleOfEquityInvestments	-696000	USD
CY2018	us-gaap	Gain Loss On Sale Of Equity Investments GainLossOnSaleOfEquityInvestments	-67000	USD
CY2017	us-gaap	Gain Loss On Sale Of Equity Investments GainLossOnSaleOfEquityInvestments	0	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-157000	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-395000	USD
CY2017	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-227000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-4994000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	24933000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	1110000	USD
CY2019	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	-151513000	USD
CY2018	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	-145164000	USD
CY2017	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	0	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-4064000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	4084000	USD
CY2017	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-4354000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	3353000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	1856000	USD
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-473000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	2934000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-2268000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-651000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	7135000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-3221000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	4703000	USD
CY2019	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-15925000	USD
CY2018	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-14550000	USD
CY2017	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	861000	USD
CY2019	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	-3497000	USD
CY2018	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	228000	USD
CY2017	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	607000	USD
CY2019	rmbs	Increasedecreaseinoperatingleaseliabilities Increasedecreaseinoperatingleaseliabilities	9282000	USD
CY2018	rmbs	Increasedecreaseinoperatingleaseliabilities Increasedecreaseinoperatingleaseliabilities	0	USD
CY2017	rmbs	Increasedecreaseinoperatingleaseliabilities Increasedecreaseinoperatingleaseliabilities	0	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	128535000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	87117000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	117437000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	6472000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	10762000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	9385000	USD
CY2019	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	0	USD
CY2018	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	350000	USD
CY2017	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	120000	USD
CY2019	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	657433000	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	282117000	USD
CY2017	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	102497000	USD
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	507385000	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	223079000	USD
CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	32048000	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	6758000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	0	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	4450000	USD
CY2019	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	29000	USD
CY2018	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	10000	USD
CY2017	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	33000	USD
CY2019	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	76039000	USD
CY2018	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	0	USD
CY2017	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	0	USD
CY2019	us-gaap	Proceeds From Sale Of Other Assets1 ProceedsFromSaleOfOtherAssets1	0	USD
CY2018	us-gaap	Proceeds From Sale Of Other Assets1 ProceedsFromSaleOfOtherAssets1	3754000	USD
CY2017	us-gaap	Proceeds From Sale Of Other Assets1 ProceedsFromSaleOfOtherAssets1	0	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	0	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	1350000	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	0	USD
CY2019	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	1000000	USD
CY2018	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	3000000	USD
CY2017	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	0	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	66780000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-141474000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-68036000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-75471000	USD
CY2019	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	0	USD
CY2017	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	172500000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2017	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	3277000	USD
CY2019	us-gaap	Payments For Hedge Financing Activities PaymentsForHedgeFinancingActivities	0	USD
CY2018	us-gaap	Payments For Hedge Financing Activities PaymentsForHedgeFinancingActivities	0	USD
CY2017	us-gaap	Payments For Hedge Financing Activities PaymentsForHedgeFinancingActivities	33523000	USD
CY2019	us-gaap	Proceeds From Issuance Of Warrants ProceedsFromIssuanceOfWarrants	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Warrants ProceedsFromIssuanceOfWarrants	0	USD
CY2017	us-gaap	Proceeds From Issuance Of Warrants ProceedsFromIssuanceOfWarrants	23173000	USD
CY2019	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	0	USD
CY2018	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	81207000	USD
CY2017	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	72257000	USD
CY2019	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	15104000	USD
CY2018	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	11402000	USD
CY2017	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	15826000	USD
CY2019	rmbs	Payments Under Installment PaymentsUnderInstallment	8379000	USD
CY2018	rmbs	Payments Under Installment PaymentsUnderInstallment	0	USD
CY2017	rmbs	Payments Under Installment PaymentsUnderInstallment	0	USD
CY2019	rmbs	Principal Payments Against Lease Financing Obligation PrincipalPaymentsAgainstLeaseFinancingObligation	0	USD
CY2018	rmbs	Principal Payments Against Lease Financing Obligation PrincipalPaymentsAgainstLeaseFinancingObligation	1080000	USD
CY2017	rmbs	Principal Payments Against Lease Financing Obligation PrincipalPaymentsAgainstLeaseFinancingObligation	860000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	50033000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	50038000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	7023000	USD
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	6766000	USD
CY2017	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	5099000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-298000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-127684000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	46445000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-497000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-989000	USD
CY2017	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	2139000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-13734000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-109592000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	90550000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	116252000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	225844000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	135294000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	102518000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	116252000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	225844000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	2372000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	3044000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	1553000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	17835000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	23581000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	22733000	USD
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	29844000	USD
CY2018	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	8225000	USD
CY2017	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	1092000	USD
CY2019	us-gaap	Nature Of Operations NatureOfOperations	Formation and Business of the Company<div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Rambus Inc. (the “Company” or “Rambus”) was incorporated in California in March 1990 and reincorporated in Delaware in March 1997. In addition to licensing, the Company is creating new business opportunities through offering products and services where its goal is to perpetuate strong company operating performance and long-term stockholder value. The Company generates revenue by licensing its inventions and solutions, selling its semiconductor products and providing services to market-leading companies.</span></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Rambus is a premier Silicon IP and Chip provider, delivering high-speed interface and embedded security solutions to make data faster and safer. With 30 years of innovation, the Company continues to develop and license the foundational technology essential to all modern system on chips (SoCs) and computing systems. The Company delivers a broad range of semiconductor solutions including architecture licenses, high-speed physical and digital controller Interface IP cores, Security IP cores and protocols, and memory interface Chips.</span></div>
CY2019	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Use of Estimates</span></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates.</span></div>
CY2019	us-gaap	Reclassifications Reclassifications	<div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Reclassifications</span></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Certain prior year balances were reclassified to conform to the current year’s presentation. None of these reclassifications had an impact on reported net income or cash flows for any of the periods presented.</span></div>
CY2019	rmbs	Share Based Compensation Arrangement By Share Based Payment Award Discount From Market Price Specific Date ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceSpecificDate	0.15
CY2019	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Credit Concentration</span></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">As of </span><span style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">December 31, 2019</span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">2018</span><span style="font-family:inherit;font-size:10pt;">, the Company’s cash, cash equivalents and marketable securities were invested with various financial institutions in the form of corporate notes, bonds and commercial paper, money market funds, U.S. Treasuries, U.S. Government Agencies, and municipal bonds and notes. The Company’s exposure to market risk for changes in interest rates relates primarily to its investment portfolio. The Company places its investments with high credit issuers and, by investment policy, attempts to limit the amount of credit exposure to any one issuer. As stated in the Company’s investment policy, it will ensure the safety and preservation of the Company’s invested funds by limiting default risk and market risk. The Company has no investments denominated in foreign country currencies and therefore is not subject to foreign exchange risk from these assets.</span></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The Company mitigates default risk by investing in high credit quality securities and by positioning its portfolio to respond appropriately to a significant reduction in a credit rating of any investment issuer or guarantor. The portfolio includes only marketable securities with active secondary or resale markets to enable portfolio liquidity.</span></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The</span><span style="font-family:inherit;font-size:10pt;color:#222222;"> Company’s note hedge transactions, entered into in connection with the 1.375% convertible senior notes due 2023 (the “2023 Notes”), expose the Company to credit risk to the extent that its counterparties may be unable to meet the terms of the transactions. The Company mitigates this risk by limiting its counterparties to major financial institutions. </span><span style="font-family:inherit;font-size:10pt;">Refer to Note 12, “Convertible Notes” for further details.</span></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The Company’s accounts receivable are derived from revenue earned from customers located in the U.S. and internationally. Refer to Note 7, “Segments and Major Customers” for further details.</span></div>
CY2019Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	21400000	USD
CY2019Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	23900000	USD
CY2019Q1	rmbs	Long Term Imputed Financing Obligation LongTermImputedFinancingObligation	37600000	USD
CY2019Q1	rmbs	Property Plant And Equipment Cost Capitalization Amount PropertyPlantAndEquipmentCostCapitalizationAmount	32000000.0	USD
CY2019Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	4500000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Gross ContractWithCustomerAssetGross	528069000	USD
CY2018Q4	us-gaap	Contract With Customer Asset Gross ContractWithCustomerAssetGross	673616000	USD
CY2019Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	11947000	USD
CY2018Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	19566000	USD
CY2019	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	18300000	USD
CY2018	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	20500000	USD
CY2019Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	22000000.0	USD
CY2019Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P2Y
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-90419000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-157957000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	-22862000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	110948000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	108450000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	110198000	shares
CY2019	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2017	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	110948000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	108450000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	110198000	shares
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.81
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.46
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.21
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.81
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.46
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.21
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2400000	shares
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2400000	shares
CY2017	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	3700000	shares
CY2018Q4	us-gaap	Goodwill Goodwill	207178000	USD
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	30322000	USD
CY2019	us-gaap	Goodwill Written Off Related To Sale Of Business Unit GoodwillWrittenOffRelatedToSaleOfBusinessUnit	54494000	USD
CY2019	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-459000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	183465000	USD
CY2019Q4	us-gaap	Goodwill Gross GoodwillGross	205235000	USD
CY2019Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	21770000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	183465000	USD
CY2018Q4	us-gaap	Goodwill Gross GoodwillGross	228948000	USD
CY2018Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	21770000	USD
CY2018Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	328470000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	268534000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	209661000	USD
CY2018	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	2483000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	207178000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	207178000	USD
CY2019Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	301982000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	247082000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	54900000	USD
CY2018Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	59936000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	17100000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	29300000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	42000000.0	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	18413000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	14411000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	7444000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	6740000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	5292000	USD
CY2019Q4	rmbs	Intangible Asset Amortization Expense After Year Five IntangibleAssetAmortizationExpenseAfterYearFive	0	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	52300000	USD
CY2019Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	2600000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	54900000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	224027000	USD
CY2018	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	231201000	USD
CY2017	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	393096000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	44700000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	57000000.0	USD
CY2019	rmbs	Maximum Maturity Period Available For Sale Securities MaximumMaturityPeriodAvailableForSaleSecurities	P3Y
CY2019	rmbs	Maximum Remaining Maturity Period Available For Sale Securities MaximumRemainingMaturityPeriodAvailableForSaleSecurities	P1Y
CY2019Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	363542000	USD
CY2019Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	363587000	USD
CY2019Q4	rmbs	Cash Cash Equivalents And Short Term Investments Unrealized Gains CashCashEquivalentsAndShortTermInvestmentsUnrealizedGains	19000	USD
CY2019Q4	rmbs	Cash Cash Equivalents And Short Term Investments Unrealized Losses CashCashEquivalentsAndShortTermInvestmentsUnrealizedLosses	64000	USD
CY2019Q4	rmbs	Cash Fair Value Disclosure CashFairValueDisclosure	44122000	USD
CY2019Q4	us-gaap	Cash Cash	44122000	USD
CY2019Q4	rmbs	Cash Cash Equivalents And Short Term Investments Fair Value Disclosure CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure	407664000	USD
CY2019Q4	rmbs	Cash Cash Equivalents And Short Term Investments Amortized Cost Disclosure CashCashEquivalentsAndShortTermInvestmentsAmortizedCostDisclosure	407709000	USD
CY2019Q4	rmbs	Gross Unrealized Gain On Securities And Cash GrossUnrealizedGainOnSecuritiesAndCash	19000	USD
CY2019Q4	rmbs	Gross Unrealized Loss On Securities And Cash GrossUnrealizedLossOnSecuritiesAndCash	64000	USD
CY2018Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	226708000	USD
CY2018Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	226809000	USD
CY2018Q4	rmbs	Cash Cash Equivalents And Short Term Investments Unrealized Gains CashCashEquivalentsAndShortTermInvestmentsUnrealizedGains	0	USD
CY2018Q4	rmbs	Cash Cash Equivalents And Short Term Investments Unrealized Losses CashCashEquivalentsAndShortTermInvestmentsUnrealizedLosses	101000	USD
CY2018Q4	rmbs	Cash Fair Value Disclosure CashFairValueDisclosure	51056000	USD
CY2018Q4	us-gaap	Cash Cash	51056000	USD
CY2018Q4	rmbs	Cash Cash Equivalents And Short Term Investments Fair Value Disclosure CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure	277764000	USD
CY2018Q4	rmbs	Cash Cash Equivalents And Short Term Investments Amortized Cost Disclosure CashCashEquivalentsAndShortTermInvestmentsAmortizedCostDisclosure	277865000	USD
CY2018Q4	rmbs	Gross Unrealized Gain On Securities And Cash GrossUnrealizedGainOnSecuritiesAndCash	0	USD
CY2018Q4	rmbs	Gross Unrealized Loss On Securities And Cash GrossUnrealizedLossOnSecuritiesAndCash	101000	USD
CY2019Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	363542000	USD
CY2018Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	226708000	USD
CY2019Q4	us-gaap	Cash Cash	44122000	USD
CY2018Q4	us-gaap	Cash Cash	51056000	USD
CY2019Q4	rmbs	Cash Cash Equivalents And Short Term Investments Fair Value Disclosure CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure	407664000	USD
CY2018Q4	rmbs	Cash Cash Equivalents And Short Term Investments Fair Value Disclosure CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure	277764000	USD
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	264934000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	216628000	USD
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	64000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	101000	USD
CY2019Q4	us-gaap	Equity Method Investment Ownership Percentage EquityMethodInvestmentOwnershipPercentage	0.250
CY2019Q4	us-gaap	Equity Method Investments EquityMethodInvestments	3600000	USD
CY2018Q4	us-gaap	Equity Method Investment Ownership Percentage EquityMethodInvestmentOwnershipPercentage	0.277
CY2018Q4	us-gaap	Equity Method Investments EquityMethodInvestments	3300000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	7926000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	8602000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	7381000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	4618000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	3977000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	23314000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	55818000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	9572000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	46246000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y10M24D
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.042
CY2019	us-gaap	Lease Cost LeaseCost	9600000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	5200000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	4400000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	10400000	USD
CY2019Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	3997000	USD
CY2018Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	2583000	USD
CY2019Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	1455000	USD
CY2018Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	145000	USD
CY2019Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	4634000	USD
CY2018Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	4044000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	10086000	USD
CY2018Q4	us-gaap	Inventory Net InventoryNet	6772000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	125803000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	140306000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	81089000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	83278000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	44714000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	57028000	USD
CY2019	us-gaap	Depreciation Depreciation	15200000	USD
CY2018	us-gaap	Depreciation Depreciation	10700000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-92000	USD
CY2017	us-gaap	Depreciation Depreciation	13300000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-10291000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	105000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-10040000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-197000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-251000	USD
CY2019Q4	us-gaap	Convertible Notes Payable ConvertibleNotesPayable	148788000	USD
CY2018Q4	us-gaap	Convertible Notes Payable ConvertibleNotesPayable	141934000	USD
CY2019Q4	us-gaap	Convertible Notes Payable Current ConvertibleNotesPayableCurrent	0	USD
CY2018Q4	us-gaap	Convertible Notes Payable Current ConvertibleNotesPayableCurrent	0	USD
CY2019Q4	us-gaap	Convertible Long Term Notes Payable ConvertibleLongTermNotesPayable	148788000	USD
CY2018Q4	us-gaap	Convertible Long Term Notes Payable ConvertibleLongTermNotesPayable	141934000	USD
CY2019Q4	rmbs	Derivative Nonmonetary Notional Amount Shares DerivativeNonmonetaryNotionalAmountShares	9100000	shares
CY2019Q4	us-gaap	Class Of Warrant Or Right Number Of Securities Called By Warrants Or Rights ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights	9100000	shares
CY2019Q4	us-gaap	Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1 ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1	23.30
CY2017Q4	us-gaap	Share Price SharePrice	14.56
CY2018Q4	rmbs	Potential Incremental Common Shares Attributable To Dilutive Effect Of Conversion Of Debt Securities PotentialIncrementalCommonSharesAttributableToDilutiveEffectOfConversionOfDebtSecurities	9100000	shares
CY2018	rmbs	Financing Expense From Lease Facilities FinancingExpenseFromLeaseFacilities	4300000	USD
CY2017	rmbs	Financing Expense From Lease Facilities FinancingExpenseFromLeaseFacilities	4400000	USD
CY2018Q4	rmbs	Current And Long Term Imputed Financing Obligation CurrentAndLongTermImputedFinancingObligation	37600000	USD
CY2018Q4	rmbs	Property Plant And Equipment Cost Capitalization Amount PropertyPlantAndEquipmentCostCapitalizationAmount	40300000	USD
CY2019Q4	us-gaap	Contractual Obligation ContractualObligation	222804000	USD
CY2019Q4	us-gaap	Contractual Obligation Due In Next Twelve Months ContractualObligationDueInNextTwelveMonths	19630000	USD
CY2019Q4	us-gaap	Contractual Obligation Due In Second Year ContractualObligationDueInSecondYear	18082000	USD
CY2019Q4	us-gaap	Contractual Obligation Due In Third Year ContractualObligationDueInThirdYear	11400000	USD
CY2019Q4	us-gaap	Contractual Obligation Due In Fourth Year ContractualObligationDueInFourthYear	173692000	USD
CY2019Q4	us-gaap	Contractual Obligation Due In Fifth Year ContractualObligationDueInFifthYear	0	USD
CY2019Q4	rmbs	Unrecognizedtaxbenefitexcludingforeigntaxwithholdings Unrecognizedtaxbenefitexcludingforeigntaxwithholdings	24600000	USD
CY2019	rmbs	Termsof Noncancellable License Agreement Minimum TermsofNoncancellableLicenseAgreementMinimum	P1Y
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Expiration Period SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod	P10Y
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1300000	USD
CY2015Q1	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	20000000.0	shares
CY2018Q1	rmbs	Upfront Payment Under Accelerated Stock Repurchase Program UpfrontPaymentUnderAcceleratedStockRepurchaseProgram	50000000.0	USD
CY2018Q1	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	3100000	shares
CY2018Q1	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	40000000.0	USD
CY2018Q1	rmbs	Unsettled Forward Contract Indexedto Issuers Stock Classifiedwithin Stock UnsettledForwardContractIndexedtoIssuersStockClassifiedwithinStock	10000000.0	USD
CY2018Q2	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	700000	shares
CY2017Q2	rmbs	Upfront Payment Under Accelerated Stock Repurchase Program UpfrontPaymentUnderAcceleratedStockRepurchaseProgram	50000000.0	USD
CY2017Q2	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	3200000	shares
CY2017Q2	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	40000000.0	USD
CY2017Q2	rmbs	Unsettled Forward Contract Indexedto Issuers Stock Classifiedwithin Stock UnsettledForwardContractIndexedtoIssuersStockClassifiedwithinStock	10000000.0	USD
CY2017Q4	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	800000	shares
CY2019Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	3600000	shares
CY2018	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	37500000	USD
CY2019	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.60
CY2019	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.50
CY2019	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.06
CY2019	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	2000000.0	USD
CY2018	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	2100000	USD
CY2017	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	2300000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-81316000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-63829000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	46031000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-5700000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-6799000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-5042000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-87016000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-70628000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	40989000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	522000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-43000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	2932000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	5451000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	20661000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	2016000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	82726000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	43678000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	657000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	333000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	495000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1198000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1708000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1592000	USD
CY2017	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1101000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-2712000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-3295000	USD
CY2017	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-2041000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3403000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	87329000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	63851000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.009
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.012
CY2017	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.007
CY2019	rmbs	Effective Income Tax Rate Reconciliation Withholding Tax EffectiveIncomeTaxRateReconciliationWithholdingTax	-0.035
CY2018	rmbs	Effective Income Tax Rate Reconciliation Withholding Tax EffectiveIncomeTaxRateReconciliationWithholdingTax	-0.077
CY2017	rmbs	Effective Income Tax Rate Reconciliation Withholding Tax EffectiveIncomeTaxRateReconciliationWithholdingTax	0.501
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.011
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.002
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.028
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Disposition Of Business EffectiveIncomeTaxRateReconciliationDispositionOfBusiness	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	-0.012
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	-0.022
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.039
CY2019	rmbs	Effective Income Tax Rate Reconciliation Executive Compensation EffectiveIncomeTaxRateReconciliationExecutiveCompensation	-0.012
CY2018	rmbs	Effective Income Tax Rate Reconciliation Executive Compensation EffectiveIncomeTaxRateReconciliationExecutiveCompensation	-0.001
CY2017	rmbs	Effective Income Tax Rate Reconciliation Executive Compensation EffectiveIncomeTaxRateReconciliationExecutiveCompensation	0.018
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.002
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.007
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.014
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.315
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-1.580
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.023
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.028
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.149
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Foreign EffectiveIncomeTaxRateReconciliationTaxCreditsForeign	-0.034
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Foreign EffectiveIncomeTaxRateReconciliationTaxCreditsForeign	-0.077
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Foreign EffectiveIncomeTaxRateReconciliationTaxCreditsForeign	0.501
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.046
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.148
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.506
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Disposition Of Business EffectiveIncomeTaxRateReconciliationDispositionOfBusiness	0.048
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Disposition Of Business EffectiveIncomeTaxRateReconciliationDispositionOfBusiness	0
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.525
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.039
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-1.236
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	1.558
CY2019Q4	rmbs	Deferred Tax Assets Depreciation And Amortization DeferredTaxAssetsDepreciationAndAmortization	13995000	USD
CY2018Q4	rmbs	Deferred Tax Assets Depreciation And Amortization DeferredTaxAssetsDepreciationAndAmortization	13085000	USD
CY2019Q4	rmbs	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	10734000	USD
CY2018Q4	rmbs	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	9522000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	8272000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	4456000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	6236000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	20900000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	21259000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	233407000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	253890000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	293014000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	302742000	USD
CY2019Q4	rmbs	Deferred Tax Liabilities Operating Lease Rightof Use Asset DeferredTaxLiabilitiesOperatingLeaseRightofUseAsset	10400000	USD
CY2018Q4	rmbs	Deferred Tax Liabilities Operating Lease Rightof Use Asset DeferredTaxLiabilitiesOperatingLeaseRightofUseAsset	0	USD
CY2019Q4	rmbs	Deferred Tax Liabilities Convertible Debt DeferredTaxLiabilitiesConvertibleDebt	151000	USD
CY2018Q4	rmbs	Deferred Tax Liabilities Convertible Debt DeferredTaxLiabilitiesConvertibleDebt	207000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	94763000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	143182000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	105314000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	143389000	USD
CY2019Q4	rmbs	Deferred Tax Assets Net Before Deducting Valuation Allowance DeferredTaxAssetsNetBeforeDeductingValuationAllowance	187700000	USD
CY2018Q4	rmbs	Deferred Tax Assets Net Before Deducting Valuation Allowance DeferredTaxAssetsNetBeforeDeductingValuationAllowance	159353000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	196972000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	173878000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	9272000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	14525000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	4574000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	4435000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	13846000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	18960000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	9272000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	14525000	USD
CY2017	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	21527000	USD
CY2018	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	113729000	USD
CY2019	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	26400000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	1900000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	115700000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	1800000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	23500000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	2100000	USD
CY2019Q4	us-gaap	Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Unrecorded Benefit SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit	100000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	23482000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	22652000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	21925000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	16485000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1032000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1083000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	76158000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	115653000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	23482000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	22652000	USD
CY2019Q4	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	14000000.0	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	1900000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	115000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	16000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	472000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	317000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	372000	USD
CY2019Q4	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	59947000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	57399000	USD
CY2019Q2	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	58297000	USD
CY2019Q1	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	48384000	USD
CY2018Q4	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	68563000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	59754000	USD
CY2018Q2	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	56458000	USD
CY2018Q1	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	46426000	USD
CY2019Q4	us-gaap	Costs And Expenses CostsAndExpenses	73158000	USD
CY2019Q3	us-gaap	Costs And Expenses CostsAndExpenses	80272000	USD
CY2019Q2	us-gaap	Costs And Expenses CostsAndExpenses	95343000	USD
CY2019Q1	us-gaap	Costs And Expenses CostsAndExpenses	79793000	USD
CY2018Q4	us-gaap	Costs And Expenses CostsAndExpenses	72763000	USD
CY2018Q3	us-gaap	Costs And Expenses CostsAndExpenses	78921000	USD
CY2018Q2	us-gaap	Costs And Expenses CostsAndExpenses	76445000	USD
CY2018Q1	us-gaap	Costs And Expenses CostsAndExpenses	90039000	USD
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	-13211000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	-22873000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	-37046000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	-31409000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	-4200000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	-19167000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	-19987000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	-43613000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	-9532000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	-17331000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	-36980000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	-26576000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	-2018000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	-104893000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	-15357000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	-35689000	USD
CY2019Q4	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-0.09
CY2019Q3	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-0.16
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CY2018Q4	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-0.02
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CY2018Q2	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-0.14
CY2018Q1	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-0.33
CY2019Q4	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	-0.09
CY2019Q3	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	-0.16
CY2019Q2	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	-0.33
CY2019Q1	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	-0.24
CY2018Q4	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	-0.02
CY2018Q3	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	-0.97
CY2018Q2	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	-0.14
CY2018Q1	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	-0.33
CY2019Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	111883000	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	111315000	shares
CY2019Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	110875000	shares
CY2019Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	109692000	shares
CY2018Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	108826000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	107897000	shares
CY2018Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	107737000	shares
CY2018Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	109358000	shares
CY2019Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	111883000	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	111315000	shares
CY2019Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	110875000	shares
CY2019Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	109692000	shares
CY2018Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	108826000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	107897000	shares
CY2018Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	107737000	shares
CY2018Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	109358000	shares

Files In Submission

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$RMBS
RAMBUS INC Stock $rmbs

2019 Q1 Form 10-K Financial Statement

#000091727320000005 Filed on February 26, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

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$RMBS RAMBUS INC Stock $rmbs

2019 Q1 Form 10-K Financial Statement

#000091727320000005 Filed on February 26, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$RMBS
RAMBUS INC Stock $rmbs