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Share-based compensation (Summary of Restricted Shares Activity) (Details) - 2011 Incentive Scheme [Member] - Restricted shares	3 Months Ended	12 Months Ended
	Dec. 31, 2019 $ / shares shares	Dec. 31, 2019 $ / shares shares
Number of restricted shares
Outstanding at the beginning of the period (in shares) | shares		0
Replacement due to acquisition of Bigo | shares	38,042,760
Granted (in shares) | shares	16,041,327
Forfeited (in shares) | shares	(7,279,877)
Vested (in shares) | shares	(8,599,959)
Outstanding at the end of the period (in shares) | shares	38,204,251	38,204,251
Expected to vest at the end | shares	32,715,029	32,715,029
Weighted average grant-date fair value
Outstanding at the beginning of the period (in dollars per share) | $ / shares		$ 0
Replacement due to acquisition of Bigo | $ / shares	$ 3.6100
Granted (in dollars per share) | $ / shares	3.4750
Forfeited (in dollars per share) | $ / shares	3.6302
Vested (in dollars per share) | $ / shares	3.6608
Outstanding at the end of the period (in dollars per share) | $ / shares	3.5267	3.5267
Expected to vest at the end (in dollars per share) | $ / shares	$ 3.5533	$ 3.5533

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Publisher FASB
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-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The number of replacement due to acquisition.

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The weightage average grant date fair value replacement due to acquisition.

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Number of expected to vest equity-based payment instruments, excluding stock (or unit) options outstanding that can be converted into shares.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for expected to vest equity-based payment instruments, outstanding.

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