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Organization and principal activities - Principal Subsidiaries and VIEs to conduct its business operations (Details)	12 Months Ended
	Dec. 31, 2019	May 11, 2018
Duowan BVI [Member]
Ownership of principal subsidiaries and principal VIEs
% of direct or indirect economic ownership	100.00%
Beijing Huanju Shidai [Member]
Ownership of principal subsidiaries and principal VIEs
% of direct or indirect economic ownership	100.00%
Guangzhou Huanju Shidai [Member]
Ownership of principal subsidiaries and principal VIEs
% of direct or indirect economic ownership	100.00%
Engage L.P. [Member]
Ownership of principal subsidiaries and principal VIEs
% of direct or indirect economic ownership	93.50%
Huya [Member]
Ownership of principal subsidiaries and principal VIEs
% of direct or indirect economic ownership	38.70%	44.00%
Huya Technology [Member]
Ownership of principal subsidiaries and principal VIEs
% of direct or indirect economic ownership	38.70%
Hago Singapore [Member]
Ownership of principal subsidiaries and principal VIEs
% of direct or indirect economic ownership	100.00%
Bigo [Member]
Ownership of principal subsidiaries and principal VIEs
% of direct or indirect economic ownership	100.00%
Bigo Singapore [Member]
Ownership of principal subsidiaries and principal VIEs
% of direct or indirect economic ownership	100.00%
Bigo HK [Member]
Ownership of principal subsidiaries and principal VIEs
% of direct or indirect economic ownership	100.00%
BaiGuoYuan Technology [Member]
Ownership of principal subsidiaries and principal VIEs
% of direct or indirect economic ownership	100.00%
Guangzhou Huaduo [Member]
Ownership of principal subsidiaries and principal VIEs
% of direct or indirect economic ownership	100.00%
Guangzhou Huya [Member]
Ownership of principal subsidiaries and principal VIEs
% of direct or indirect economic ownership	38.70%
Guangzhou BaiGuoYuan [Member]
Ownership of principal subsidiaries and principal VIEs
% of direct or indirect economic ownership	100.00%

X

- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=118582676&loc=SL6759159-111685

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- Definition

It represents the percentage of ownership.

+ References

No definition available.

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- Definition

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No definition available.

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