v3.26.1
Benefits and interests of directors - Summary of Detailed Information of Directors Emoluments (Detail) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information of directors emoluments [line items]      
Salaries and bonuses ¥ 26,378 ¥ 37,412 ¥ 26,074
Pension costs - defined contribution plans 385 374 359
Other benefits 4,633 6,262 7,267
Total 31,396 41,754 14,651
Director [Member]      
Disclosure of detailed information of directors emoluments [line items]      
Director's fee 2,770 1,946 2,000
Salaries and bonuses 10,067 20,237 12,570
Pension costs - defined contribution plans 147 158 109
Other Social security and housing fund 106 118 60
Other benefits 2,217 4,271 4,274
Total 15,307 26,730 19,013
Director [Member] | Executive Directors [member] | Yong Suk Cho [Member]      
Disclosure of detailed information of directors emoluments [line items]      
Salaries and bonuses 7,362 13,050 7,390
Pension costs - defined contribution plans 75 69 66
Other Social security and housing fund 33 40 20
Other benefits 2,082 2,069 2,076
Total 9,552 15,228 9,552
Director [Member] | Executive Directors [member] | Gregory Dean Gibb [member]      
Disclosure of detailed information of directors emoluments [line items]      
Salaries and bonuses   4,097 5,180
Pension costs - defined contribution plans   43 43
Other Social security and housing fund   32 40
Other benefits   2,137 2,198
Total   6,309 7,461
Director [Member] | Executive Directors [member] | Peiqing Zhu [Member]      
Disclosure of detailed information of directors emoluments [line items]      
Salaries and bonuses 750 3,090  
Pension costs - defined contribution plans 24 46  
Other Social security and housing fund 23 46  
Other benefits 95 65  
Total 892 3,247  
Director [Member] | Executive Directors [member] | Tongzhuan Xi [Member]      
Disclosure of detailed information of directors emoluments [line items]      
Salaries and bonuses 1,955    
Pension costs - defined contribution plans 48    
Other Social security and housing fund 50    
Other benefits 40    
Total 2,093    
Director [Member] | Non-Executive Directors [member] | Xudong Zhang [member]      
Disclosure of detailed information of directors emoluments [line items]      
Director's fee   446 500
Total   446 500
Director [Member] | Non-Executive Directors [member] | Weidong Li [member]      
Disclosure of detailed information of directors emoluments [line items]      
Director's fee 311 500 500
Total 311 500 500
Director [Member] | Non-Executive Directors [member] | Rusheng Yang [member]      
Disclosure of detailed information of directors emoluments [line items]      
Director's fee 500 500 500
Total 500 500 500
Director [Member] | Non-Executive Directors [member] | David Xianglin Li [member]      
Disclosure of detailed information of directors emoluments [line items]      
Director's fee 500 500 500
Total 500 500 500
Director [Member] | Non-Executive Directors [member] | Hui Liu [Member]      
Disclosure of detailed information of directors emoluments [line items]      
Director's fee 0 0  
Salaries and bonuses 0 0  
Pension costs - defined contribution plans 0 0  
Other Social security and housing fund 0 0  
Other benefits 0 0  
Total 0 ¥ 0  
Director [Member] | Non-Executive Directors [member] | Guangheng Ji [member]      
Disclosure of detailed information of directors emoluments [line items]      
Salaries and bonuses     0
Pension costs - defined contribution plans     0
Other Social security and housing fund     0
Other benefits     0
Total     ¥ 0
Director [Member] | Non-Executive Directors [member] | Dicky Peter YIP [Member]      
Disclosure of detailed information of directors emoluments [line items]      
Director's fee 1,270    
Total 1,270    
Director [Member] | Non-Executive Directors [member] | Wai Ping Tina Lee [Member]      
Disclosure of detailed information of directors emoluments [line items]      
Director's fee 189    
Total ¥ 189