XML 73 R60.htm IDEA: XBRL DOCUMENT v3.22.1
SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Intangible assets and Prepaid land use rights (Details)
 12 Months Ended
Dec. 31, 2021
Technical know-how  
Intangible assets  
Amortization period 10 years
Computer software | Minimum  
Intangible assets  
Amortization period 1 year
Computer software | Maximum  
Intangible assets  
Amortization period 10 years
Land use rights | Minimum  
Intangible assets  
Amortization period 20 years
Land use rights | Maximum  
Intangible assets  
Amortization period 50 years