XML 40 R31.htm IDEA: XBRL DOCUMENT v3.23.1

REVENUE - Narrative (Details)	Mar. 31, 2023 sourceOfRevenue user
Disaggregation of Revenue [Line Items]
Number of sources of revenue | sourceOfRevenue	3
Number of users | user	6
Number of hours to make certification decision	48 hours
Number of days to take exam	21 days
Expiration period to take exams	1 year
Minimum
Disaggregation of Revenue [Line Items]
Subscription period	6 months
Maximum
Disaggregation of Revenue [Line Items]
Subscription period	1 year

X

- Definition

Contract With Customer, Certification Period Prior To Test Completion

+ References

No definition available.

+ Details

Name:	duol_ContractWithCustomerCertificationPeriodPriorToTestCompletion
Namespace Prefix:	duol_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Contract With Customer, Number Of Users Per Subscription

+ References

No definition available.

+ Details

Name:	duol_ContractWithCustomerNumberOfUsersPerSubscription
Namespace Prefix:	duol_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Contract With Customer, Threshold Period To Take Exam For Bulk Purchase

+ References

No definition available.

+ Details

Name:	duol_ContractWithCustomerThresholdPeriodToTakeExamForBulkPurchase
Namespace Prefix:	duol_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Contract With Customer, Threshold To Take Exam

+ References

No definition available.

+ Details

Name:	duol_ContractWithCustomerThresholdToTakeExam
Namespace Prefix:	duol_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number Of Sources Of Revenue

+ References

No definition available.

+ Details

Name:	duol_NumberOfSourcesOfRevenue
Namespace Prefix:	duol_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130556-203045

+ Details

Name:	us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: