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Intangible Assets - Summary of Intangible Assets (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance ¥ 954,144    
Amortization 1,012 $ 156 ¥ 1,012
Intangible assets and goodwill ending balance 1,483,968 229,315 954,144
Technology Know-how [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance 9,110    
Intangible assets and goodwill ending balance 8,098 1,251 9,110
Development costs [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance 562,587    
Intangible assets and goodwill ending balance 1,093,423 168,965 562,587
Goodwill [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance 212,636    
Intangible assets and goodwill ending balance 212,636 32,858 212,636
Trademarks [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance 169,811    
Intangible assets and goodwill ending balance 169,811 $ 26,241 169,811
Cost [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance 1,087,531   551,012
Addition 530,836   536,519
Intangible assets and goodwill ending balance 1,618,367   1,087,531
Cost [member] | Technology Know-how [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance 136,822   136,822
Intangible assets and goodwill ending balance 136,822   136,822
Cost [member] | Development costs [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance 562,587   195,879
Addition 530,836   366,708
Intangible assets and goodwill ending balance 1,093,423   562,587
Cost [member] | Goodwill [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance 218,311   218,311
Intangible assets and goodwill ending balance 218,311   218,311
Cost [member] | Trademarks [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance 169,811    
Addition     169,811
Intangible assets and goodwill ending balance 169,811   169,811
Accumulated depreciation, amortisation and impairment [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance (133,387)   (132,375)
Amortization 1,012   1,012
Intangible assets and goodwill ending balance (134,399)   (133,387)
Accumulated depreciation, amortisation and impairment [member] | Technology Know-how [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance (127,712)   (126,700)
Amortization 1,012   1,012
Intangible assets and goodwill ending balance (128,724)   (127,712)
Accumulated depreciation, amortisation and impairment [member] | Goodwill [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance (5,675)   (5,675)
Intangible assets and goodwill ending balance ¥ (5,675)   ¥ (5,675)