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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Intangible assets (Details)
12 Months Ended
Dec. 31, 2021
Minimum | Software  
Intangible assets  
Estimated useful lives of intangible assets 3 years
Minimum | License  
Intangible assets  
Estimated useful lives of intangible assets 3 years
Minimum | Other intangible assets  
Intangible assets  
Estimated useful lives of intangible assets 1 year
Maximum | Software  
Intangible assets  
Estimated useful lives of intangible assets 6 years
Maximum | License  
Intangible assets  
Estimated useful lives of intangible assets 20 years
Maximum | Other intangible assets  
Intangible assets  
Estimated useful lives of intangible assets 30 years