Nature of operations and reorganizations - First Reorganization (Details)	May 18, 2018 item
Nature of operations and reorganizations
Preferred Share Financing, Number of Investors	2

Represents the number of investors with whom preferred share financing is closed.

No definition available.

Name:	rlx_PreferredShareFinancingNumberOfInvestors
Namespace Prefix:	rlx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration