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Summary of Significant Accounting Policies - Property, equipment and software, net (Details)	12 Months Ended
	Dec. 31, 2019
Buildings
Property, Plant and Equipment [Line Items]
Estimated useful lives	20 years
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	2 years
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Furniture, office equipment
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Furniture, office equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Motor vehicles | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Motor vehicles | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	4 years
Software | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	2 years
Software | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	10 years

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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