$RMBS
RAMBUS INC Stock $rmbs

$rmbs Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-K Financial Statement

#000091727321000005 Filed on February 26, 2021

Income Statement

Concept	2020 Q4	2020	2019 Q4
Revenue	$61.91M	$246.3M	$59.95M
YoY Change	3.28%	8.22%	-12.57%
Cost Of Revenue	$13.45M	$60.75M	$14.58M
YoY Change	-7.72%	18.24%	37.51%
Gross Profit	$48.46M	$185.6M	$45.37M
YoY Change	6.81%	5.3%	-21.77%
Gross Profit Margin	78.27%	75.34%	75.69%
Selling, General & Admin	$22.10M	$86.44M	$21.30M
YoY Change	3.76%	-14.03%	-14.11%
% of Gross Profit	45.6%	46.58%	46.95%
Research & Development	$34.80M	$139.8M	$36.80M
YoY Change	-5.43%	-10.83%	-1.6%
% of Gross Profit	71.81%	75.35%	81.11%
Depreciation & Amortization	$13.50M	$22.10M	$11.40M
YoY Change	18.42%	44.44%	52.0%
% of Gross Profit	27.86%	11.91%	25.13%
Operating Expenses	$59.47M	$229.6M	$58.58M
YoY Change	1.51%	-16.91%	-5.82%
Operating Profit	-$11.00M	-$44.05M	-$13.21M
YoY Change	-16.71%	-56.01%	214.55%
Interest Expense	$800.0K	$10.34M	$3.800M
YoY Change	-78.95%	4.95%	-5.0%
% of Operating Profit
Other Income/Expense, Net		$7.515M
YoY Change		-57.28%
Pretax Income	-$7.500M	-$39.94M	-$5.000M
YoY Change	50.0%	-48.03%	2400.0%
Income Tax	$1.500M	$3.932M	$0.00
% Of Pretax Income
Net Earnings	-$12.07M	-$40.47M	-$9.532M
YoY Change	26.58%	-52.92%	372.35%
Net Earnings / Revenue	-19.49%	-16.43%	-15.9%
Basic Earnings Per Share		-$0.36
Diluted Earnings Per Share	-$78.97K	-$0.36	-$44.62K
COMMON SHARES
Basic Shares Outstanding	112.7M shares	113.3M shares	111.9M shares
Diluted Shares Outstanding	112.7M shares	113.3M shares	111.9M shares

Balance Sheet

Concept	2020 Q4	2020	2019 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$502.6M	$502.6M	$407.7M
YoY Change	23.29%	23.28%	46.76%
Cash & Equivalents	$129.0M	$136.1M	$102.2M
Short-Term Investments	$373.7M	$366.5M	$305.5M
Other Short-Term Assets	$15.90M	$15.90M	$18.50M
YoY Change	-14.05%	-14.05%	17.83%
Inventory	$14.47M	$14.50M	$10.09M
Prepaid Expenses
Receivables	$27.90M	$166.7M	$44.04M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$699.7M	$699.7M	$664.7M
YoY Change	5.27%	5.27%	25.95%
LONG-TERM ASSETS
Property, Plant & Equipment	$57.69M	$86.40M	$44.71M
YoY Change	29.03%	4.6%	-21.59%
Goodwill	$183.2M		$183.5M
YoY Change	-0.13%		-11.45%
Intangibles	$36.49M		$54.90M
YoY Change	-33.54%		-8.4%
Long-Term Investments	$2.800M		$3.600M
YoY Change	-22.22%		9.09%
Other Assets	$4.535M	$245.6M	$5.931M
YoY Change	-23.54%	-31.38%	-24.2%
Total Long-Term Assets	$551.7M	$551.7M	$674.3M
YoY Change	-18.18%	-18.71%	-19.09%
TOTAL ASSETS
Total Short-Term Assets	$699.7M	$699.7M	$664.7M
Total Long-Term Assets	$551.7M	$551.7M	$674.3M
Total Assets	$1.251B	$1.251B	$1.339B
YoY Change	-6.54%	-6.85%	-1.63%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$8.993M	$9.000M	$9.549M
YoY Change	-5.82%	-5.26%	29.18%
Accrued Expenses	$28.10M	$28.10M	$26.60M
YoY Change	5.64%	5.64%	57.4%
Deferred Revenue	$10.20M		$11.95M
YoY Change	-14.64%		-38.33%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$0.00	$0.00
YoY Change
Total Short-Term Liabilities	$85.86M	$85.90M	$86.18M
YoY Change	-0.37%	-0.35%	24.38%
LONG-TERM LIABILITIES
Long-Term Debt	$156.0M	$156.0M	$148.8M
YoY Change	4.84%	4.84%	-16.5%
Other Long-Term Liabilities	$6.894M	$82.50M	$19.27M
YoY Change	-64.23%	-30.85%	264.52%
Total Long-Term Liabilities	$6.894M	$238.5M	$19.27M
YoY Change	-64.23%	-11.04%	264.52%
TOTAL LIABILITIES
Total Short-Term Liabilities	$85.86M	$85.90M	$86.18M
Total Long-Term Liabilities	$6.894M	$238.5M	$19.27M
Total Liabilities	$338.7M	$338.7M	$368.1M
YoY Change	-7.98%	-7.99%	5.45%
SHAREHOLDERS EQUITY
Retained Earnings	-$357.8M		-$290.2M
YoY Change	23.26%		42.07%
Common Stock	$1.271B		$1.261B
YoY Change	0.74%		2.82%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$912.7M	$912.7M	$975.4M
YoY Change
Total Liabilities & Shareholders Equity	$1.251B	$1.251B	$1.339B
YoY Change	-6.54%	-6.85%	-1.63%

Cashflow Statement

Concept	2020 Q4	2020	2019 Q4
OPERATING ACTIVITIES
Net Income	-$12.07M	-$40.47M	-$9.532M
YoY Change	26.58%	-52.92%	372.35%
Depreciation, Depletion And Amortization	$13.50M	$22.10M	$11.40M
YoY Change	18.42%	44.44%	52.0%
Cash From Operating Activities	$42.10M	$185.5M	$42.90M
YoY Change	-1.86%	44.29%	22.57%
INVESTING ACTIVITIES
Capital Expenditures	-$8.900M	$29.73M	-$2.300M
YoY Change	286.96%	359.33%	-30.3%
Acquisitions		$0.00
YoY Change		-100.0%
Other Investing Activities	$64.60M	-$60.70M	-$28.30M
YoY Change	-328.27%	-55.04%	-44.4%
Cash From Investing Activities	$55.70M	-$97.60M	-$30.60M
YoY Change	-282.03%	-31.01%	-43.44%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$50.07M
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-51.30M	-$61.19M	-2.100M
YoY Change	2342.86%	20432.21%	-310.0%
NET CHANGE
Cash From Operating Activities	42.10M	$185.5M	42.90M
Cash From Investing Activities	55.70M	-$97.60M	-30.60M
Cash From Financing Activities	-51.30M	-$61.19M	-2.100M
Net Change In Cash	46.50M	$26.81M	10.20M
YoY Change	355.88%	-295.18%	-156.35%
FREE CASH FLOW
Cash From Operating Activities	$42.10M	$185.5M	$42.90M
Capital Expenditures	-$8.900M	$29.73M	-$2.300M
Free Cash Flow	$51.00M	$155.7M	$45.20M
YoY Change	12.83%	27.58%	18.02%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0000917273
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020Q4	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
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2020Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2019Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2020Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2019Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2020Q4	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
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	500000000	shares
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	500000000	shares
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	111697994	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	112131352	shares
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	111697994	shares
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	112131352	shares
CY2020Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	357000	USD
CY2019Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	342000	USD
CY2018Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	328000	USD
CY2019	rmbs	Maximum Maturity Period Available For Sale Securities MaximumMaturityPeriodAvailableForSaleSecurities	P3Y
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	000-22339
CY2020	dei	Entity Registrant Name EntityRegistrantName	RAMBUS INC.
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	94-3112828
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	4453 North First Street
CY2020	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 100
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	San Jose
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	CA
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	95134
CY2020	dei	City Area Code CityAreaCode	408
CY2020	dei	Local Phone Number LocalPhoneNumber	462-8000
CY2020	dei	Security12b Title Security12bTitle	Common Stock, $.001 Par Value
CY2020	dei	Trading Symbol TradingSymbol	RMBS
CY2020	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2020Q2	dei	Entity Public Float EntityPublicFloat	1300000000	USD
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CY2020Q4	us-gaap	Convertible Long Term Notes Payable ConvertibleLongTermNotesPayable	156031000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	905113000	USD
CY2020Q4	rmbs	Upfront Payment Under Accelerated Stock Repurchase Program UpfrontPaymentUnderAcceleratedStockRepurchaseProgram	50000000.0	USD
CY2020Q4	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	2600000	shares
CY2020Q4	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	40000000.0	USD
CY2020Q4	rmbs	Unsettled Forward Contract Indexedto Issuers Stock Classifiedwithin Stock UnsettledForwardContractIndexedtoIssuersStockClassifiedwithinStock	10000000.0	USD
CY2020Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	17400000	shares
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CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
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CY2020	us-gaap	Operating Expenses OperatingExpenses	228806000	USD
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CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	-46807000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	-104539000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	-86967000	USD
CY2020	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	17516000	USD
CY2019	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	27375000	USD
CY2018	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	32621000	USD
CY2020	us-gaap	Interest Expense InterestExpense	10340000	USD
CY2019	us-gaap	Interest Expense InterestExpense	9852000	USD
CY2018	us-gaap	Interest Expense InterestExpense	16282000	USD
CY2020	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	7176000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	17523000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	16339000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-39631000	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
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3978000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3403000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	87329000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-43609000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-90419000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-157957000	USD
CY2020	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-0.39
CY2019	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-0.81
CY2018	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-1.46
CY2020	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	-0.39
CY2019	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	-0.81
CY2018	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	-1.46
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	113254000	shares
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
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	113254000	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
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-43609000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-90419000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-157957000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	24000	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
CY2020	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	-13000	USD
CY2019	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	54000	USD
CY2018	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	-747000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-43598000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-80220000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-163151000	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	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	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
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-43609000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	24000	USD
CY2020	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	-13000	USD
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	2084000	USD
CY2020	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	50069000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	25778000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	905113000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-43609000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-90419000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-157957000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	25778000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	26476000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	21736000	USD
CY2020	rmbs	Depreciationandamortizationofoperatingleasesrightofuseassets Depreciationandamortizationofoperatingleasesrightofuseassets	28951000	USD
CY2019	rmbs	Depreciationandamortizationofoperatingleasesrightofuseassets Depreciationandamortizationofoperatingleasesrightofuseassets	23507000	USD
CY2018	rmbs	Depreciationandamortizationofoperatingleasesrightofuseassets Depreciationandamortizationofoperatingleasesrightofuseassets	10745000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	18413000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	17058000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	29341000	USD
CY2020	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	7243000	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
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	685000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1816000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	79954000	USD
CY2020	us-gaap	Restructuring Costs RestructuringCosts	0	USD
CY2019	us-gaap	Restructuring Costs RestructuringCosts	0	USD
CY2018	us-gaap	Restructuring Costs RestructuringCosts	670000	USD
CY2020	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	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
CY2020	us-gaap	Gain Loss On Sale Of Equity Investments GainLossOnSaleOfEquityInvestments	-747000	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
CY2020	us-gaap	Availableforsale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	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
CY2020	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	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
CY2020	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	77000	USD
CY2019	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-157000	USD
CY2018	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-395000	USD
CY2020	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	-1800000	USD
CY2019	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	0	USD
CY2018	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	0	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-16136000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-4994000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	24933000	USD
CY2020	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	-160116000	USD
CY2019	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	-151513000	USD
CY2018	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	-145164000	USD
CY2020	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-2042000	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
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	4380000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	3353000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	1856000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-2176000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	2934000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-2268000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	3353000	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
CY2020	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-17852000	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
CY2020	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	-1486000	USD
CY2019	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	-3497000	USD
CY2018	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	228000	USD
CY2020	rmbs	Increasedecreaseinoperatingleaseliabilities Increasedecreaseinoperatingleaseliabilities	6625000	USD
CY2019	rmbs	Increasedecreaseinoperatingleaseliabilities Increasedecreaseinoperatingleaseliabilities	9282000	USD
CY2018	rmbs	Increasedecreaseinoperatingleaseliabilities Increasedecreaseinoperatingleaseliabilities	0	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	185459000	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
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	29728000	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
CY2020	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	0	USD
CY2019	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	0	USD
CY2018	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	350000	USD
CY2020	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	898957000	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
CY2020	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	817834000	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
CY2020	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	21588000	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
CY2020	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	0	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
CY2020	us-gaap	Proceeds From Sale Of Other Assets Investing Activities ProceedsFromSaleOfOtherAssetsInvestingActivities	0	USD
CY2019	us-gaap	Proceeds From Sale Of Other Assets Investing Activities ProceedsFromSaleOfOtherAssetsInvestingActivities	0	USD
CY2018	us-gaap	Proceeds From Sale Of Other Assets Investing Activities ProceedsFromSaleOfOtherAssetsInvestingActivities	3754000	USD
CY2020	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	0	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
CY2020	us-gaap	Payment For Contingent Consideration Liability Investing Activities PaymentForContingentConsiderationLiabilityInvestingActivities	1131000	USD
CY2019	us-gaap	Payment For Contingent Consideration Liability Investing Activities PaymentForContingentConsiderationLiabilityInvestingActivities	0	USD
CY2018	us-gaap	Payment For Contingent Consideration Liability Investing Activities PaymentForContingentConsiderationLiabilityInvestingActivities	0	USD
CY2020	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	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
CY2020	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	0	USD
CY2019	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	1000000	USD
CY2018	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	3000000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	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
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-90394000	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
CY2020	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	0	USD
CY2019	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	0	USD
CY2018	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	81207000	USD
CY2020	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	11487000	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
CY2020	rmbs	Payments Under Installment PaymentsUnderInstallment	13201000	USD
CY2019	rmbs	Payments Under Installment PaymentsUnderInstallment	8379000	USD
CY2018	rmbs	Payments Under Installment PaymentsUnderInstallment	0	USD
CY2020	rmbs	Principal Payments Against Lease Financing Obligation PrincipalPaymentsAgainstLeaseFinancingObligation	0	USD
CY2019	rmbs	Principal Payments Against Lease Financing Obligation PrincipalPaymentsAgainstLeaseFinancingObligation	0	USD
CY2018	rmbs	Principal Payments Against Lease Financing Obligation PrincipalPaymentsAgainstLeaseFinancingObligation	1080000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	50069000	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
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	9403000	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
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-61186000	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
CY2020	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	106000	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
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	33985000	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
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
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	136503000	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
CY2020	us-gaap	Interest Paid Net InterestPaidNet	2372000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	2372000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	3044000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	21312000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	17835000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	23581000	USD
CY2020	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	20952000	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
CY2020	us-gaap	Nature Of Operations NatureOfOperations	Formation and Business of the Company<div style="margin-bottom:8pt;text-indent:13.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">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="margin-bottom:8pt;text-indent:13.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Rambus produces products and innovations that address the fundamental challenges of accelerating data. The Company makes industry-leading chips and IP that enable critical performance improvements for data center and other growing markets. The ongoing shift to the cloud, along with the widespread advancement of artificial intelligence (“AI”) across the data center, 5G, automotive and Internet of Things (“IoT”), has led to an exponential growth in data usage and tremendous demands on data infrastructure. Creating fast and safe connections, both in and across systems, remains one of the most mission-critical design challenges limiting performance in advanced hardware for these markets.</span></div>
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-bottom:8pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Use of Estimates</span></div><div style="margin-bottom:8pt;text-indent:13.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">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>
CY2020	us-gaap	Reclassifications Reclassifications	<div style="margin-bottom:8pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Reclassifications</span></div><div style="margin-bottom:8pt;text-indent:13.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">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>
CY2020	rmbs	Share Based Compensation Arrangement By Share Based Payment Award Discount From Market Price Specific Date ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceSpecificDate	0.15
CY2020	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="margin-bottom:8pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Credit Concentration</span></div><div style="margin-bottom:8pt;text-indent:13.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">As of December 31, 2020 and 2019, 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 </span></div><div style="margin-bottom:8pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">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="margin-bottom:8pt;text-indent:13.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">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="margin-bottom:8pt;text-indent:13.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The</span><span style="color:#222222;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> 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="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Refer to Note 12, “Convertible Notes” for further details.</span></div><div style="margin-bottom:8pt;text-indent:13.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">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><div style="margin-bottom:8pt;text-indent:13.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company’s unbilled receivables are collected from customers located in the U.S. and internationally. Refer to Note 4, “Revenue Recognition” for further details.</span></div>
CY2020Q4	us-gaap	Contract With Customer Asset Gross ContractWithCustomerAssetGross	367953000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Gross ContractWithCustomerAssetGross	528069000	USD
CY2020Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	10461000	USD
CY2019Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	11947000	USD
CY2020	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	10300000	USD
CY2019	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	18300000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	17400000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P2Y
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-43609000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-90419000	USD
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2400000	shares
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-157957000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	113254000	shares
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
CY2020	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	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
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	113254000	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
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.39
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.81
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.46
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.39
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.81
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.46
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2300000	shares
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2400000	shares
CY2019Q4	us-gaap	Goodwill Goodwill	183465000	USD
CY2020	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	-243000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	183222000	USD
CY2020Q4	us-gaap	Goodwill Gross GoodwillGross	204992000	USD
CY2020Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	21770000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	183222000	USD
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
CY2020Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	301982000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	265495000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	36487000	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
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	18400000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	17100000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	29300000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	14611000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	7644000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	6940000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	5492000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	200000	USD
CY2020Q4	rmbs	Intangible Asset Amortization Expense After Year Five IntangibleAssetAmortizationExpenseAfterYearFive	0	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	34887000	USD
CY2020Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	1600000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	36487000	USD
CY2020	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	242747000	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
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	57700000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	44700000	USD
CY2020	rmbs	Maximum Maturity Period Available For Sale Securities MaximumMaturityPeriodAvailableForSaleSecurities	P3Y
CY2020Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	441186000	USD
CY2020Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	441244000	USD
CY2020Q4	rmbs	Cash Cash Equivalents And Short Term Investments Unrealized Gains CashCashEquivalentsAndShortTermInvestmentsUnrealizedGains	64000	USD
CY2020Q4	rmbs	Cash Cash Equivalents And Short Term Investments Unrealized Losses CashCashEquivalentsAndShortTermInvestmentsUnrealizedLosses	122000	USD
CY2020Q4	rmbs	Cash Fair Value Disclosure CashFairValueDisclosure	61463000	USD
CY2020Q4	us-gaap	Cash Cash	61463000	USD
CY2020Q4	rmbs	Cash Cash Equivalents And Short Term Investments Fair Value Disclosure CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure	502649000	USD
CY2020Q4	rmbs	Cash Cash Equivalents And Short Term Investments Amortized Cost Disclosure CashCashEquivalentsAndShortTermInvestmentsAmortizedCostDisclosure	502707000	USD
CY2020Q4	rmbs	Gross Unrealized Gain On Securities And Cash GrossUnrealizedGainOnSecuritiesAndCash	64000	USD
CY2020Q4	rmbs	Gross Unrealized Loss On Securities And Cash GrossUnrealizedLossOnSecuritiesAndCash	122000	USD
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
CY2020Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	441186000	USD
CY2019Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	363542000	USD
CY2020Q4	rmbs	Cash Fair Value Disclosure CashFairValueDisclosure	61463000	USD
CY2019Q4	rmbs	Cash Fair Value Disclosure CashFairValueDisclosure	44122000	USD
CY2020Q4	rmbs	Cash Cash Equivalents And Short Term Investments Fair Value Disclosure CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure	502649000	USD
CY2019Q4	rmbs	Cash Cash Equivalents And Short Term Investments Fair Value Disclosure CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure	407664000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	10832000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	254250000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	264934000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	122000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	64000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Fair Value AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	334332000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	74039000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	408371000	USD
CY2020Q4	us-gaap	Equity Method Investment Ownership Percentage EquityMethodInvestmentOwnershipPercentage	0.250
CY2020Q4	us-gaap	Equity Method Investments EquityMethodInvestments	2800000	USD
CY2019Q4	us-gaap	Equity Method Investment Ownership Percentage EquityMethodInvestmentOwnershipPercentage	0.250
CY2019Q4	us-gaap	Equity Method Investments EquityMethodInvestments	3600000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	8616000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	7382000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	4570000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	3925000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	4043000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	21325000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	49861000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	39029000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y1M6D
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.042
CY2020	us-gaap	Lease Cost LeaseCost	9500000	USD
CY2019	us-gaap	Lease Cost LeaseCost	9600000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	5200000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	7200000	USD
CY2020Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	7945000	USD
CY2019Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	3997000	USD
CY2020Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	650000	USD
CY2019Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	1455000	USD
CY2020Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	5871000	USD
CY2019Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	4634000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	14466000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	10086000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	140370000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	125803000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	82677000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	81089000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	57693000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	44714000	USD
CY2020	us-gaap	Depreciation Depreciation	21200000	USD
CY2019	us-gaap	Depreciation Depreciation	15200000	USD
CY2018	us-gaap	Depreciation Depreciation	10700000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	129000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	105000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-210000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-197000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-81000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-92000	USD
CY2017	us-gaap	Payments For Hedge Financing Activities PaymentsForHedgeFinancingActivities	33500000	USD
CY2017Q4	rmbs	Derivative Nonmonetary Notional Amount Shares DerivativeNonmonetaryNotionalAmountShares	9100000	shares
CY2017Q4	us-gaap	Class Of Warrant Or Right Number Of Securities Called By Warrants Or Rights ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights	9100000	shares
CY2017Q4	us-gaap	Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1 ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1	23.30
CY2017Q4	us-gaap	Share Price SharePrice	14.56
CY2017	us-gaap	Proceeds From Issuance Of Warrants ProceedsFromIssuanceOfWarrants	23200000	USD
CY2020	rmbs	Potential Incremental Common Shares Attributable To Dilutive Effect Of Conversion Of Debt Securities PotentialIncrementalCommonSharesAttributableToDilutiveEffectOfConversionOfDebtSecurities	9100000	shares
CY2020Q4	us-gaap	Contractual Obligation ContractualObligation	203776000	USD
CY2020Q4	us-gaap	Contractual Obligation Due In Next Twelve Months ContractualObligationDueInNextTwelveMonths	18283000	USD
CY2020Q4	us-gaap	Contractual Obligation Due In Second Year ContractualObligationDueInSecondYear	11801000	USD
CY2020Q4	us-gaap	Contractual Obligation Due In Third Year ContractualObligationDueInThirdYear	173692000	USD
CY2020Q4	us-gaap	Contractual Obligation Due In Fourth Year ContractualObligationDueInFourthYear	0	USD
CY2020Q4	us-gaap	Contractual Obligation Due In Fifth Year ContractualObligationDueInFifthYear	0	USD
CY2020Q4	rmbs	Unrecognizedtaxbenefitexcludingforeigntaxwithholdings Unrecognizedtaxbenefitexcludingforeigntaxwithholdings	25500000	USD
CY2020	rmbs	Termsof Noncancellable License Agreement Minimum TermsofNoncancellableLicenseAgreementMinimum	P1Y
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Expiration Period SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod	P10Y
CY2020Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	17400000	shares
CY2020Q4	rmbs	Upfront Payment Under Accelerated Stock Repurchase Program UpfrontPaymentUnderAcceleratedStockRepurchaseProgram	50000000.0	USD
CY2020Q4	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	2600000	shares
CY2020Q4	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	40000000.0	USD
CY2020Q4	rmbs	Unsettled Forward Contract Indexedto Issuers Stock Classifiedwithin Stock UnsettledForwardContractIndexedtoIssuersStockClassifiedwithinStock	10000000.0	USD
CY2020	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.60
CY2020	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.50
CY2020	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.06
CY2020	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	1800000	USD
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
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	2932000	USD
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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
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CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1708000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1592000	USD
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	195000	USD
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CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3403000	USD
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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
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	87329000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
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
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CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.009
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CY2019	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.016
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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
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CY2020	us-gaap	Effective Income Tax Rate Reconciliation Disposition Of Business EffectiveIncomeTaxRateReconciliationDispositionOfBusiness	-0.188
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CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.003
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CY2019Q4	rmbs	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	10734000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	5347000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	9522000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	4631000	USD
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CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	15756000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	20900000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	169063000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	233407000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	216712000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	293014000	USD
CY2020Q4	rmbs	Deferred Tax Liabilities Operating Lease Rightof Use Asset DeferredTaxLiabilitiesOperatingLeaseRightofUseAsset	6392000	USD
CY2019Q4	rmbs	Deferred Tax Liabilities Operating Lease Rightof Use Asset DeferredTaxLiabilitiesOperatingLeaseRightofUseAsset	10400000	USD
CY2020Q4	rmbs	Deferred Tax Liabilities Convertible Debt DeferredTaxLiabilitiesConvertibleDebt	130000	USD
CY2019Q4	rmbs	Deferred Tax Liabilities Convertible Debt DeferredTaxLiabilitiesConvertibleDebt	151000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	45845000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	94763000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	52367000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	105314000	USD
CY2020Q4	rmbs	Deferred Tax Assets Net Before Deducting Valuation Allowance DeferredTaxAssetsNetBeforeDeductingValuationAllowance	164345000	USD
CY2019Q4	rmbs	Deferred Tax Assets Net Before Deducting Valuation Allowance DeferredTaxAssetsNetBeforeDeductingValuationAllowance	187700000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	174328000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	196972000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	9983000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	9272000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	9272000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	9983000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	110900000	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
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	18600000	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
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	76158000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	115000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	134044000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	115653000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	209000	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
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	23482000	USD
CY2020Q4	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	16400000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	1800000	USD
CY2020Q4	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	61913000	USD
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CY2020Q4	us-gaap	Cost Of Revenue CostOfRevenue	13451000	USD
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CY2020Q1	us-gaap	Gross Profit GrossProfit	48104000	USD
CY2020Q2	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	59930000	USD
CY2020Q1	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	63989000	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
CY2020Q3	us-gaap	Cost Of Revenue CostOfRevenue	15264000	USD
CY2020Q2	us-gaap	Cost Of Revenue CostOfRevenue	16148000	USD
CY2020Q1	us-gaap	Cost Of Revenue CostOfRevenue	15885000	USD
CY2019Q4	us-gaap	Cost Of Revenue CostOfRevenue	14576000	USD
CY2019Q3	us-gaap	Cost Of Revenue CostOfRevenue	12574000	USD
CY2019Q2	us-gaap	Cost Of Revenue CostOfRevenue	13027000	USD
CY2019Q1	us-gaap	Cost Of Revenue CostOfRevenue	11198000	USD
CY2020Q4	us-gaap	Gross Profit GrossProfit	48462000	USD
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CY2019Q3	us-gaap	Gross Profit GrossProfit	44825000	USD
CY2019Q2	us-gaap	Gross Profit GrossProfit	45270000	USD
CY2019Q1	us-gaap	Gross Profit GrossProfit	37186000	USD
CY2020Q4	us-gaap	Operating Expenses OperatingExpenses	59466000	USD
CY2020Q3	us-gaap	Operating Expenses OperatingExpenses	54151000	USD
CY2020Q2	us-gaap	Operating Expenses OperatingExpenses	56246000	USD
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CY2019Q3	us-gaap	Operating Expenses OperatingExpenses	67698000	USD
CY2019Q2	us-gaap	Operating Expenses OperatingExpenses	82316000	USD
CY2019Q1	us-gaap	Operating Expenses OperatingExpenses	68595000	USD
CY2020Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	-11004000	USD
CY2020Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	-12500000	USD
CY2020Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	-12464000	USD
CY2020Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	-10839000	USD
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	-13211000	USD
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
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
CY2020Q4	us-gaap	Net Income Loss NetIncomeLoss	-12066000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	-12779000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	-10781000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	-7983000	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
CY2020Q4	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-0.11
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CY2020Q2	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-0.09
CY2020Q1	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-0.07
CY2019Q4	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-0.09
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CY2019Q1	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-0.24
CY2020Q4	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	-0.11
CY2020Q3	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	-0.11
CY2020Q2	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	-0.09
CY2020Q1	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	-0.07
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
CY2020Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	112706000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	113828000	shares
CY2020Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	113572000	shares
CY2020Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	112907000	shares
CY2019Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	111883000	shares
CY2019Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	109692000	shares
CY2020Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	112706000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	113828000	shares
CY2020Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	113572000	shares
CY2020Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	112907000	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

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$RMBS
RAMBUS INC Stock $rmbs

2020 Q4 Form 10-K Financial Statement

#000091727321000005 Filed on February 26, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$RMBS RAMBUS INC Stock $rmbs

2020 Q4 Form 10-K Financial Statement

#000091727321000005 Filed on February 26, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$RMBS
RAMBUS INC Stock $rmbs