Name:	rlx_ExciseTaxRate
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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Represents the maximum percentage of general reserve fund as a percentage of the registered capital of the company.

No definition available.

Name:	rlx_GeneralReserveFundMaximumPercentage
Namespace Prefix:	rlx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Represents the minimum percentage of statutory after-tax profit required to be appropriated to general reserve fund.

No definition available.

Name:	rlx_GeneralReserveFundMinimumPercentage
Namespace Prefix:	rlx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Profit appropriation to statutory surplus fund.

No definition available.

Name:	rlx_ProfitAppropriationToStatutorySurplusFund
Namespace Prefix:	rlx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of shipping expense incurred during the period.

No definition available.

Name:	rlx_ShippingExpense
Namespace Prefix:	rlx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

No definition available.

Name:	rlx_StatutoryReservesAbstract
Namespace Prefix:	rlx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Represents the maximum percentage of statutory surplus fund as a percentage of the registered capital of the company.

No definition available.

Name:	rlx_StatutorySurplusFundMaximumPercentage
Namespace Prefix:	rlx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Represents the minimum percentage of statutory after-tax profit required to be appropriated to statutory surplus fund.

No definition available.

Name:	rlx_StatutorySurplusFundMinimumPercentage
Namespace Prefix:	rlx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

The amount of subsidy income recorded during the period.

No definition available.

Name:	rlx_SubsidyIncome
Namespace Prefix:	rlx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

No definition available.

Name:	rlx_SubsidyIncomeAbstract
Namespace Prefix:	rlx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 720
-SubTopic 35
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483406/720-35-50-1

Name:	us-gaap_AdvertisingExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

No definition available.

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

Amount of cost for defined contribution plan.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480794/715-70-50-1

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

No definition available.

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

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-18

Name:	us-gaap_NumberOfOperatingSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Amount of credit loss expense (reversal of expense) for financing receivable.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(11))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1

Name:	us-gaap_ProvisionForLoanLossesExpensed
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

No definition available.

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

No definition available.

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

Amount of interest expense for an underpayment of income taxes.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-15