$DUOL
Duolingo, Inc. Stock $duol

$duol Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-K Financial Statement

#000156208822000039 Filed on March 04, 2022

Income Statement

Concept	2021 Q4	2021	2020 Q4
Revenue	$73.01M	$250.8M	$48.30M
YoY Change	51.17%	55.09%	108.19%
Cost Of Revenue	$19.95M	$69.19M	$12.90M
YoY Change	54.67%	50.45%	92.54%
Gross Profit	$53.06M	$181.6M	$35.40M
YoY Change	49.89%	56.93%	114.55%
Gross Profit Margin	72.67%	72.41%	73.29%
Selling, General & Admin	$39.59M	$137.8M	$30.50M
YoY Change	29.81%	75.05%	160.68%
% of Gross Profit	74.62%	75.86%	86.16%
Research & Development	$30.02M	$103.8M	$15.40M
YoY Change	94.93%	95.82%	65.59%
% of Gross Profit	56.57%	57.18%	43.5%
Depreciation & Amortization	$757.0K	$2.726M	$1.300M
YoY Change	-41.77%	20.83%
% of Gross Profit	1.43%	1.5%	3.67%
Operating Expenses	$69.82M	$241.6M	$45.90M
YoY Change	52.12%	83.41%	118.57%
Operating Profit	-$16.76M	-$60.01M	-$10.50M
YoY Change	59.61%	274.79%	133.33%
Interest Expense
YoY Change
% of Operating Profit
Other Income/Expense, Net	$6.000K	$49.00K	$200.0K
YoY Change	-97.0%	-83.83%	100.0%
Pretax Income	-$17.41M	-$59.96M	-$10.40M
YoY Change	67.39%	281.7%	136.36%
Income Tax	$108.0K	$177.0K	$0.00
% Of Pretax Income
Net Earnings	-$17.52M	-$60.14M	-$10.40M
YoY Change	68.43%	281.18%	136.36%
Net Earnings / Revenue	-23.99%	-23.98%	-21.53%
Basic Earnings Per Share		-$2.57
Diluted Earnings Per Share	-$461.8K	-$2.57	-$0.29
COMMON SHARES
Basic Shares Outstanding		23.43M shares
Diluted Shares Outstanding		23.43M shares

Balance Sheet

Concept	2021 Q4	2021	2020 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$553.9M	$553.9M
YoY Change		359.72%
Cash & Equivalents	$553.9M	$553.9M	$120.5M
Short-Term Investments
Other Short-Term Assets	$32.19M	$32.19M
YoY Change		84.55%
Inventory
Prepaid Expenses
Receivables	$33.16M	$33.16M	$20.45M
Other Receivables	$0.00	$0.00
Total Short-Term Assets	$619.3M	$619.3M	$158.4M
YoY Change	291.0%	291.0%
LONG-TERM ASSETS
Property, Plant & Equipment	$8.211M	$36.58M	$6.428M
YoY Change	27.74%	152.26%
Goodwill	$0.00
YoY Change
Intangibles	$4.566M
YoY Change
Long-Term Investments
YoY Change
Other Assets	$894.0K	$894.0K	$562.0K
YoY Change	59.07%	59.07%
Total Long-Term Assets	$42.04M	$42.04M	$17.36M
YoY Change	142.18%	142.18%
TOTAL ASSETS
Total Short-Term Assets	$619.3M	$619.3M	$158.4M
Total Long-Term Assets	$42.04M	$42.04M	$17.36M
Total Assets	$661.3M	$661.3M	$175.7M
YoY Change	276.3%	276.3%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$7.818M	$7.818M	$2.196M
YoY Change	256.01%	256.01%
Accrued Expenses	$12.93M	$8.808M	$8.634M
YoY Change	49.79%	51.5%
Deferred Revenue	$98.27M		$54.79M
YoY Change	79.35%		108.28%
Short-Term Debt	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$119.1M	$119.1M	$65.69M
YoY Change	81.35%	81.35%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$0.00
YoY Change
Other Long-Term Liabilities	$29.12M	$29.12M
YoY Change		258.18%
Total Long-Term Liabilities	$29.12M	$29.12M
YoY Change		258.18%
TOTAL LIABILITIES
Total Short-Term Liabilities	$119.1M	$119.1M	$65.69M
Total Long-Term Liabilities	$29.12M	$29.12M
Total Liabilities	$148.3M	$148.3M	$73.82M
YoY Change	100.83%	100.83%
SHAREHOLDERS EQUITY
Retained Earnings	-$170.9M		-$110.8M
YoY Change	54.28%
Common Stock	$4.000K		$1.000K
YoY Change	300.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$513.1M	$513.1M	-$80.69M
YoY Change
Total Liabilities & Shareholders Equity	$661.3M	$661.3M	$175.7M
YoY Change	276.3%	276.3%

Cashflow Statement

Concept	2021 Q4	2021	2020 Q4
OPERATING ACTIVITIES
Net Income	-$17.52M	-$60.14M	-$10.40M
YoY Change	68.43%	281.18%	136.36%
Depreciation, Depletion And Amortization	$757.0K	$2.726M	$1.300M
YoY Change	-41.77%	20.83%
Cash From Operating Activities	$432.0K	$9.170M	$4.500M
YoY Change	-90.4%	-48.22%
INVESTING ACTIVITIES
Capital Expenditures	-$1.108M	$3.586M	$1.700M
YoY Change	-165.18%	6.22%
Acquisitions		$0.00
YoY Change
Other Investing Activities
YoY Change
Cash From Investing Activities	-$1.108M	-$6.206M	-$1.700M
YoY Change	-34.82%	54.61%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$868.0K
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	5.158M	$430.5M	36.60M
YoY Change	-85.91%	816.81%
NET CHANGE
Cash From Operating Activities	432.0K	$9.170M	4.500M
Cash From Investing Activities	-1.108M	-$6.206M	-1.700M
Cash From Financing Activities	5.158M	$430.5M	36.60M
Net Change In Cash	4.482M	$433.4M	39.40M
YoY Change	-88.62%	614.68%
FREE CASH FLOW
Cash From Operating Activities	$432.0K	$9.170M	$4.500M
Capital Expenditures	-$1.108M	$3.586M	$1.700M
Free Cash Flow	$1.540M	$5.584M	$2.800M
YoY Change	-45.0%	-61.04%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	10445000	USD
CY2021	duol	Increase Decrease In Capitalized Contract Costs Net IncreaseDecreaseInCapitalizedContractCostsNet	10634000	USD
CY2020	duol	Increase Decrease In Capitalized Contract Costs Net IncreaseDecreaseInCapitalizedContractCostsNet	6653000	USD
CY2021	dei	Entity Central Index Key EntityCentralIndexKey	0001562088
CY2021	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2021	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2021	dei	Amendment Flag AmendmentFlag	false
CY2021Q2	dei	Entity Public Float EntityPublicFloat	0	USD
CY2021Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#AccruedLiabilitiesCurrent
CY2020Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#AccruedLiabilitiesCurrent
CY2021	dei	Document Type DocumentType	10-K
CY2021	dei	Document Annual Report DocumentAnnualReport	true
CY2021	dei	Document Period End Date DocumentPeriodEndDate	2021-12-31
CY2021	dei	Document Transition Report DocumentTransitionReport	false
CY2021	dei	Entity File Number EntityFileNumber	001-40653
CY2021	dei	Entity Registrant Name EntityRegistrantName	Duolingo, Inc.
CY2021	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2021	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	45-3055872
CY2021	dei	Entity Address Address Line1 EntityAddressAddressLine1	5900 Penn Avenue
CY2021	dei	Entity Address City Or Town EntityAddressCityOrTown	Pittsburgh
CY2021	dei	Entity Address State Or Province EntityAddressStateOrProvince	PA
CY2021	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	15206
CY2021	dei	City Area Code CityAreaCode	(412)
CY2021	dei	Local Phone Number LocalPhoneNumber	567-6602
CY2021	dei	Security12b Title Security12bTitle	Class A common stock, $0.0001 per share
CY2021	dei	Trading Symbol TradingSymbol	DUOL
CY2021	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2021	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2021	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2021	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2021	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021	dei	Entity Filer Category EntityFilerCategory	Non-accelerated Filer
CY2021	dei	Entity Small Business EntitySmallBusiness	false
CY2021	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	true
CY2021	dei	Entity Ex Transition Period EntityExTransitionPeriod	false
CY2021	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	false
CY2021	dei	Entity Shell Company EntityShellCompany	false
CY2021	dei	Auditor Firm AuditorFirmId	34
CY2021	dei	Auditor Name AuditorName	Deloitte & Touche LLP
CY2021	dei	Auditor Location AuditorLocation	New York, New York
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CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	120490000	USD
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CY2021Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
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CY2021	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	12480000	USD
CY2020	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	2030000	USD
CY2021	duol	Payments For Repurchase Of Stock Options PaymentsForRepurchaseOfStockOptions	7335000	USD
CY2020	duol	Payments For Repurchase Of Stock Options PaymentsForRepurchaseOfStockOptions	0	USD
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	868000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	430468000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	46953000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	433432000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	60647000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	120490000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	59843000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	553922000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	120490000	USD
CY2021	us-gaap	Interest Paid Net InterestPaidNet	0	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	0	USD
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	132000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	0	USD
CY2021	duol	Cloud Computing Expenditures Incurred But Not Yet Paid CloudComputingExpendituresIncurredButNotYetPaid	64000	USD
CY2020	duol	Cloud Computing Expenditures Incurred But Not Yet Paid CloudComputingExpendituresIncurredButNotYetPaid	0	USD
CY2021	duol	Capitalized Software Expenditures Incurred But Not Yet Paid CapitalizedSoftwareExpendituresIncurredButNotYetPaid	342000	USD
CY2020	duol	Capitalized Software Expenditures Incurred But Not Yet Paid CapitalizedSoftwareExpendituresIncurredButNotYetPaid	500000	USD
CY2021	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	230000	USD
CY2020	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	0	USD
CY2021Q3	us-gaap	Proceeds From Issuance Initial Public Offering ProceedsFromIssuanceInitialPublicOffering	455532000	USD
CY2021	us-gaap	Use Of Estimates UseOfEstimates	<span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:130%">Use of Estimates—</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:130%">The preparation of Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the Consolidated Financial Statements and accompanying notes. Significant estimates and assumptions reflected in the Consolidated Financial Statements include, but are not limited to, useful lives of property and equipment, valuation of deferred tax assets and liabilities, stock-based compensation, common stock valuation, operating lease right-of-use assets and liabilities, capitalization of internally developed software and associated useful lives and contingent liabilities. Actual results may differ materially from such estimates. Management believes that the estimates, and judgments upon which they rely, are reasonable based upon information available to them at the time that these estimates and judgments are made. To the extent that there are material differences between these estimates and actual results, the Company’s Consolidated Financial Statements will be affected.</span>
CY2021Q3	duol	Deferred Offering Costs Reclassified To Stockholders Equity DeferredOfferingCostsReclassifiedToStockholdersEquity	4865000	USD
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	553922000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	120490000	USD
CY2021	us-gaap	Advertising Expense AdvertisingExpense	42964000	USD
CY2020	us-gaap	Advertising Expense AdvertisingExpense	27352000	USD
CY2021Q4	duol	Selling And Marketing Expense Volunteer Program Award Amount SellingAndMarketingExpenseVolunteerProgramAwardAmount	4220000	USD
CY2021Q1	duol	Selling And Marketing Expense Volunteer Program Fee Amount SellingAndMarketingExpenseVolunteerProgramFeeAmount	526000	USD
CY2021	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="margin-bottom:9pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:130%">Concentration of Credit Risk</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:130%">—The Company’s concentration of credit risk relates to financial institutions holding the Company’s cash and cash equivalents and platforms with significant accounts receivable balances and revenue transactions.</span></div><div style="margin-bottom:9pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:130%">The Company maintains cash deposits with financial institutions that may exceed federally insured limits at times. Management believes that the financial institutions that hold the Company’s deposits are financially credit worthy and, accordingly, minimal credit risk exists with respect to those balances.</span></div>
CY2021	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	250772000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	161696000	USD
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	250772000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	161696000	USD
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	250772000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	161696000	USD
CY2020Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	54792000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	26307000	USD
CY2021	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	-54792000	USD
CY2020	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	-26307000	USD
CY2021	duol	Contract With Customer Liability Revenue Recognized Excluding Opening Balance ContractWithCustomerLiabilityRevenueRecognizedExcludingOpeningBalance	-139371000	USD
CY2020	duol	Contract With Customer Liability Revenue Recognized Excluding Opening Balance ContractWithCustomerLiabilityRevenueRecognizedExcludingOpeningBalance	-91193000	USD
CY2021	duol	Contract With Customer Liability Additions During The Period ContractWithCustomerLiabilityAdditionsDuringThePeriod	237638000	USD
CY2020	duol	Contract With Customer Liability Additions During The Period ContractWithCustomerLiabilityAdditionsDuringThePeriod	145985000	USD
CY2021Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	98267000	USD
CY2020Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	54792000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	13311000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	9495000	USD
CY2021Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	5100000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	3067000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	8211000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	6428000	USD
CY2021	us-gaap	Depreciation Depreciation	2033000	USD
CY2020	us-gaap	Depreciation Depreciation	1624000	USD
CY2021Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	11144000	USD
CY2020Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	8181000	USD
CY2021Q4	us-gaap	Capitalized Computer Software Accumulated Amortization CapitalizedComputerSoftwareAccumulatedAmortization	6578000	USD
CY2020Q4	us-gaap	Capitalized Computer Software Accumulated Amortization CapitalizedComputerSoftwareAccumulatedAmortization	5885000	USD
CY2021Q4	us-gaap	Capitalized Computer Software Net CapitalizedComputerSoftwareNet	4566000	USD
CY2021	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1266000	USD
CY2020Q4	us-gaap	Capitalized Computer Software Net CapitalizedComputerSoftwareNet	2296000	USD
CY2021	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	693000	USD
CY2020	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	632000	USD
CY2021	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	693000	USD
CY2020	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	632000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Renewal Term LesseeOperatingLeaseRenewalTerm	P5Y
CY2021Q4	duol	Lessee Operating Lease Option To Terminate Notice LesseeOperatingLeaseOptionToTerminateNotice	P12M
CY2021Q4	duol	Lessee Operating Lease Number Of Extension Options LesseeOperatingLeaseNumberOfExtensionOptions	2	tranche
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	1919000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	1721000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	317000	USD
CY2021	us-gaap	Variable Lease Cost VariableLeaseCost	28000	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	0	USD
CY2021	us-gaap	Lease Cost LeaseCost	3213000	USD
CY2020	us-gaap	Lease Cost LeaseCost	2038000	USD
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	1819000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	0	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	22274000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	USD
CY2021	duol	Right Of Use Asset Disposed Operating Lease Liabilities RightOfUseAssetDisposedOperatingLeaseLiabilities	235000	USD
CY2020	duol	Right Of Use Asset Disposed Operating Lease Liabilities RightOfUseAssetDisposedOperatingLeaseLiabilities	0	USD
CY2021	us-gaap	Gain Loss On Termination Of Lease GainLossOnTerminationOfLease	31000	USD
CY2020	us-gaap	Gain Loss On Termination Of Lease GainLossOnTerminationOfLease	0	USD
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P9Y
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y11M
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0577
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0670
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	5153000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	6624000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	4572000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	3106000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	3173000	USD
CY2021Q4	duol	Lessee Operating Lease Liability To Be Paid Due After Year Five LesseeOperatingLeaseLiabilityToBePaidDueAfterYearFive	21763000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	44391000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	11931000	USD
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	32460000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1111000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	177000	USD
CY2021	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	97000	USD
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	80000	USD
CY2020	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	68000	USD
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	26000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	42000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	61605000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	20912000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1881000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1063000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Research DeferredTaxAssetsTaxCreditCarryforwardsResearch	14480000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Research DeferredTaxAssetsTaxCreditCarryforwardsResearch	4936000	USD
CY2021Q4	duol	Deferred Tax Assets Leasing Arrangements DeferredTaxAssetsLeasingArrangements	7335000	USD
CY2020Q4	duol	Deferred Tax Assets Leasing Arrangements DeferredTaxAssetsLeasingArrangements	2184000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	56000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	3468000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	65000	USD
CY2021Q4	duol	Deferred Tax Assets State Taxes And Vat Taxes DeferredTaxAssetsStateTaxesAndVATTaxes	277000	USD
CY2020Q4	duol	Deferred Tax Assets State Taxes And Vat Taxes DeferredTaxAssetsStateTaxesAndVATTaxes	544000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	76293000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	26236000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	9341000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	3468000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	6389000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	1908000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1894000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1014000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Capitalized Software DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware	1057000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Capitalized Software DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware	543000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	3000	USD
CY2021Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	9341000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	0	USD
CY2020Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	0	USD
CY2021	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	50057000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	26236000	USD
CY2020Q1	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	23851000	USD
CY2021	duol	Deferred Tax Asset Valuation Allowance Additions DeferredTaxAssetValuationAllowanceAdditions	50057000	USD
CY2020	duol	Deferred Tax Asset Valuation Allowance Additions DeferredTaxAssetValuationAllowanceAdditions	2928000	USD
CY2021	duol	Deferred Tax Asset Valuation Allowance Released DeferredTaxAssetValuationAllowanceReleased	0	USD
CY2020	duol	Deferred Tax Asset Valuation Allowance Released DeferredTaxAssetValuationAllowanceReleased	543000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	76293000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	26236000	USD
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2021	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.065
CY2020	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.018
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	-0.135
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.538
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.184
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.005
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.018
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.159
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.102
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.835
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.132
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.003
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.004
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2021Q3	us-gaap	Preferred Stock Convertible Conversion Ratio PreferredStockConvertibleConversionRatio	1
CY2021Q3	us-gaap	Temporary Equity Shares Authorized TemporaryEquitySharesAuthorized	19074000	shares
CY2020Q4	us-gaap	Temporary Equity Shares Authorized TemporaryEquitySharesAuthorized	19074000	shares
CY2021Q3	us-gaap	Temporary Equity Shares Outstanding TemporaryEquitySharesOutstanding	19074000	shares
CY2020Q4	us-gaap	Temporary Equity Shares Outstanding TemporaryEquitySharesOutstanding	19074000	shares
CY2020Q4	us-gaap	Temporary Equity Liquidation Preference TemporaryEquityLiquidationPreference	183300000	USD
CY2021Q3	us-gaap	Temporary Equity Liquidation Preference TemporaryEquityLiquidationPreference	183300000	USD
CY2020Q4	duol	Temporary Equity Funds Received TemporaryEquityFundsReceived	183300000	USD
CY2021Q3	duol	Temporary Equity Funds Received TemporaryEquityFundsReceived	183300000	USD
CY2020Q4	duol	Temporary Equity Fees Incurred TemporaryEquityFeesIncurred	691000	USD
CY2021Q3	duol	Temporary Equity Fees Incurred TemporaryEquityFeesIncurred	691000	USD
CY2021Q3	us-gaap	Temporary Equity Carrying Amount Attributable To Parent TemporaryEquityCarryingAmountAttributableToParent	182609000	USD
CY2020Q4	us-gaap	Temporary Equity Carrying Amount Attributable To Parent TemporaryEquityCarryingAmountAttributableToParent	182609000	USD
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	8365000	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	10.68
CY2021Q1	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P7Y5M19D
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	230596000	USD
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	72000	shares
CY2021	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	52.80
CY2021	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	1882000	shares
CY2021	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	6.63
CY2021	duol	Share Based Compensation Arrangement By Share Based Payment Award Options Repurchases In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsRepurchasesInPeriod	220000	shares
CY2021	duol	Share Based Compensation Arrangements By Share Based Payment Award Options Repurchases In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsRepurchasesInPeriodWeightedAverageExercisePrice	4.81
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	80000	shares
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	14.75
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	6255000	shares
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	12.53
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P6Y11M1D
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	585339000	USD
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	4420000	shares
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	10.61
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P6Y4M28D
CY2021Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	422076000	USD
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	194513000	USD
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	6058000	USD
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	24.61
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	9.77
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum	0.0104
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum	0.0114
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum	0.0032
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum	0.0068
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P5Y10M24D
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y3D
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum	0.4890
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum	0.4912
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum	0.4550
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum	0.4938
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0
CY2021Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions	13428000	USD
CY2021Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	65906000	USD
CY2021Q4	duol	Share Based Payment Arrangement Equity Instruments Other Than Options Trading Price Period ShareBasedPaymentArrangementEquityInstrumentsOtherThanOptionsTradingPricePeriod	60	day
CY2021Q1	us-gaap	Share Price SharePrice	38.08
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	40804000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	17031000	USD
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	40804000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	17031000	USD
CY2021Q4	us-gaap	Sales And Excise Tax Payable Current SalesAndExciseTaxPayableCurrent	2319000	USD
CY2020Q4	us-gaap	Sales And Excise Tax Payable Current SalesAndExciseTaxPayableCurrent	2301000	USD
CY2021Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	3336000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1111000	USD
CY2021Q4	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	2075000	USD
CY2020Q4	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	889000	USD
CY2021Q4	us-gaap	Accrued Marketing Costs Current AccruedMarketingCostsCurrent	1078000	USD
CY2020Q4	us-gaap	Accrued Marketing Costs Current AccruedMarketingCostsCurrent	1513000	USD
CY2021Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	4125000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	2820000	USD
CY2021Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	12933000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	8634000	USD
CY2021	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	3438000	USD
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1796000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	-60135000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-15776000	USD
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	23433000	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	23433000	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	12735000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	12735000	shares
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-2.57
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.24
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-2.57
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.24
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	4604000	shares
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	23265000	shares

Files In Submission

Name	View Source	Status
0001562088-22-000039-index-headers.html	Edgar Link	pending
0001562088-22-000039-index.html	Edgar Link	pending
0001562088-22-000039.txt	Edgar Link	pending
0001562088-22-000039-xbrl.zip	Edgar Link	pending
consentforannual10-k.htm	Edgar Link	pending
duol-20211231.htm	Edgar Link	pending
duol-20211231.xsd	Edgar Link	pending
duol-20211231_cal.xml	Edgar Link	unprocessable
duol-20211231_def.xml	Edgar Link	unprocessable
duol-20211231_g1.jpg	Edgar Link	pending
duol-20211231_htm.xml	Edgar Link	completed
duol-20211231_lab.xml	Edgar Link	unprocessable
duol-20211231_pre.xml	Edgar Link	unprocessable
duol-2021x10xkex4descripti.htm	Edgar Link	pending
duolingo-2021q410qex311.htm	Edgar Link	pending
duolingo-2021q410qex312.htm	Edgar Link	pending
duolingo-2021q410qex321.htm	Edgar Link	pending
exhibit211-202110xkx2022x0.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
image_0a.jpg	Edgar Link	pending
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image_9a.jpg	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
new_leasexexecutedxxsignedx.htm	Edgar Link	pending
R1.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending
signature.jpg	Edgar Link	pending

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$DUOL
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2021 Q4 Form 10-K Financial Statement

#000156208822000039 Filed on March 04, 2022

Income Statement

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$DUOL Duolingo, Inc. Stock $duol

2021 Q4 Form 10-K Financial Statement

#000156208822000039 Filed on March 04, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$DUOL
Duolingo, Inc. Stock $duol