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PRINCIPAL ACCOUNTING POLICIES - Basis of Presentation (Details) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Mar. 18, 2021	Dec. 31, 2020
Ordinary shares, par value (in dollars per share)	$ 0.00125	$ 0.00125	$ 0.01	$ 0.00125
Common Stock, Conversion Basis	ordinary share will be adjusted from eight (8) ADSs representing one (1) ordinary share to one (1) ADS representing one (1) ordinary share (the “ADS Ratio Change”).
Share Subdivision
Ordinary shares, par value (in dollars per share)	$ 0.00125

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- Definition

Description of basis for conversion of convertible common stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Face amount or stated value per share of common stock.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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