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PRINCIPAL ACCOUNTING POLICIES - Summary of property, equipment and software (Details)	6 Months Ended
	Jun. 30, 2022
Leasehold improvement
PRINCIPAL ACCOUNTING POLICIES
Property, plant and equipment, estimated useful lives	Shorter of lease term or estimated useful life of the assets
Furniture and fixtures
PRINCIPAL ACCOUNTING POLICIES
Property, plant and equipment, useful life	5 years
Software
PRINCIPAL ACCOUNTING POLICIES
Property, plant and equipment, useful life	5 years
Minimum | Electronic equipment
PRINCIPAL ACCOUNTING POLICIES
Property, plant and equipment, useful life	3 years
Minimum | Motor vehicles
PRINCIPAL ACCOUNTING POLICIES
Property, plant and equipment, useful life	3 years
Maximum | Electronic equipment
PRINCIPAL ACCOUNTING POLICIES
Property, plant and equipment, useful life	5 years
Maximum | Motor vehicles
PRINCIPAL ACCOUNTING POLICIES
Property, plant and equipment, useful life	5 years

X

- Definition

Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 35
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123364984&loc=d3e1205-110223

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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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X

- 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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X

- Details

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X

- Details

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- Details

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- Details

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- Details

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- Details

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