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Related party transactions - Schedule of Relationship Between Related Parties with their Groups (Detail)	12 Months Ended
	Dec. 31, 2020
Chuan Wang
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Chairman and director of the Company (note i)
Shenglong Zou
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Co-founder, director and shareholder of the Company
Weimin Luo
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Director and Chief Operating Officer of the Company
Shenzhen Crystal Technology Co., Ltd.
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Company owned by a co-founder and director of the Company
Vantage Point Global Limited
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Shareholder of the Company
Aiden & Jasmine Limited
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Shareholder of the Company
Millet Technology Co., Ltd. [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Note ii
Millet Communication Technology Co., Ltd. [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Note ii
Beijing Xiaomi Mobile Software Co., Ltd. ("Beijing Xiaomi Mobile Software") [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Note ii
Beijing Millet Payment Technologies Co., Ltd. ("Beijing Millet Payment Technologies") [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Note ii
Guangzhou Millet Information Service Co Ltd [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Note ii
Shenzhen Xiaomi Technology Co., Ltd.
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Note ii
Beijing Itui
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Company owned by the principal shareholder of the Company (note iii)
Itui Online
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Company owned by the principal shareholder of the Company (note iii)

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- Definition

This element represents a description of the nature of common ownership or management control relationships with other entities, regardless of there being transactions between the entities, when the existence of that control could result in operating results or financial position of the reporting entity significantly different from that which would have been obtained if the entities' were autonomous.

+ References

No definition available.

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- Definition

Schedule of Other Related Party Transactions [Line Items]

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No definition available.

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