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Fair value measurements - Schedule of Certain Significant Estimates (Details)			12 Months Ended
	May 10, 2018	Mar. 08, 2018	Dec. 31, 2019	Dec. 31, 2018
Volatility			56.00%	57.00%
Risk-free rate			1.82%	2.77%
Dividend yield			0.00%	0.00%
Huya's Pre IPO Preferred Shares
Volatility	50.00%	50.00%
Dividend yield	0.00%	0.00%
Risk-free rate (3 months) [Member] | Huya's Pre IPO Preferred Shares
Risk-free rate	1.58%	1.66%
Risk-free rate (4 years) [Member] | Huya's Pre IPO Preferred Shares
Risk-free rate	2.46%	2.52%

X

- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(ii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iv)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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