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SUBSEQUENT EVENTS - Compensation Committee (Details) - Subsequent event
Feb. 28, 2022
USD ($)
shares
Subsequent Event [Line Items]  
Fair value of shares issued | $ $ 1,694,000
Class B ordinary shares | Yin Shenping [Member]  
Subsequent Event [Line Items]  
Number of shares issued 800,000
Class B ordinary shares | Chen Guangqiang [Member]  
Subsequent Event [Line Items]  
Number of shares issued 1,600,000