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TAXATION (Details) ¥ in Thousands, $ in Thousands	1 Months Ended		6 Months Ended
	May 31, 2016	Apr. 30, 2016	Jun. 30, 2021 USD ($)	Jun. 30, 2020	Jun. 30, 2021 CNY (¥)	Dec. 31, 2020 CNY (¥)
Taxation
Unrecognized tax benefits that if recognized would affect the annual effective tax rate					¥ 34,322	¥ 34,763
China
Taxation
VAT payable					2,675	2,176
Business tax payable					¥ 17,406	¥ 17,456
Income tax rate (as percent)			25.00%	25.00%
China | Minimum
Taxation
VAT (as a percent)	3.00%
Business tax (as a percent)		3.00%	3.00%
China | Maximum
Taxation
VAT (as a percent)	6.00%
Business tax (as a percent)		5.00%	5.00%
Hong Kong | Tax rate for the first HK$ 2,000 of assessable profits
Taxation
Assessable profits to calculate tax rate | $			$ 2,000
Income tax rate (as percent)			8.25%
Hong Kong | Tax rate for profits exceeding HK$ 2,000
Taxation
Assessable profits to calculate tax rate | $			$ 2,000
Income tax rate (as percent)			16.50%
Taiwan
Taxation
Income tax rate (as percent)			17.00%

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.Fact.4)
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-Topic 740
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-Section 50
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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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