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Share-based Payment Arrangements - Summary of Fair Value using Trinomial Tree Model and Inputs (Detail)
 12 Months Ended
Dec. 31, 2022
yr
$ / shares
Dec. 31, 2022
yr
¥ / shares
Dec. 31, 2021
yr
¥ / shares
Dec. 31, 2020
yr
¥ / shares
Trinomial Tree Model [member] | USISH two thousand and twenty share options plan [Member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Share price at the grant date | ¥ / shares   ¥ 21.55    
Exercise price | ¥ / shares   ¥ 21.65    
Trinomial Tree Model [member] | USISH employee stock ownership restricted stock ownership plan amendment 2021 [Member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Share price at the grant date | $ / shares $ 30.2      
Exercise price | $ / shares 30      
Trinomial Tree Model [member] | AMPI Two Thousand And Twenty Two Share Options Plan [Member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Share price at the grant date | $ / shares 7.5      
Exercise price | $ / shares $ 7.5      
Binomial Method [Member] | USISH employee stock ownership restricted stock ownership plan amendment 2020 [Member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Share price at the grant date | ¥ / shares       ¥ 24.3
Expected volatility       56.97%
Lock-up periods       1.3
Risk free interest rate       2.63%
Binomial Method [Member] | USISH employee stock ownership restricted stock ownership plan amendment 2021 [Member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Share price at the grant date | ¥ / shares     ¥ 14.65  
Expected volatility     47.15%  
Lock-up periods     1.3  
Risk free interest rate     2.34%  
Bottom of range [member] | Trinomial Tree Model [member] | USISH two thousand and twenty share options plan [Member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Expected volatility 48.14% 48.14%    
Expected lives 2.2 2.2    
Risk free interest rate 2.80% 2.80%    
Bottom of range [member] | Trinomial Tree Model [member] | USISH employee stock ownership restricted stock ownership plan amendment 2021 [Member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Expected volatility 65.85% 65.85%    
Expected lives 5.8 5.8    
Risk free interest rate 1.11% 1.11%    
Bottom of range [member] | Trinomial Tree Model [member] | AMPI Two Thousand And Twenty Two Share Options Plan [Member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Expected volatility 65.35% 65.35%    
Expected lives 6 6    
Risk free interest rate 1.15% 1.15%    
Top of range [member] | Trinomial Tree Model [member] | USISH two thousand and twenty share options plan [Member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Expected volatility 53.57% 53.57%    
Expected lives 4.2 4.2    
Risk free interest rate 2.99% 2.99%    
Top of range [member] | Trinomial Tree Model [member] | USISH employee stock ownership restricted stock ownership plan amendment 2021 [Member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Expected volatility 67.29% 67.29%    
Expected lives 6.8 6.8    
Risk free interest rate 1.15% 1.15%    
Top of range [member] | Trinomial Tree Model [member] | AMPI Two Thousand And Twenty Two Share Options Plan [Member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Expected volatility 67.78% 67.78%    
Expected lives 7 7    
Risk free interest rate 1.19% 1.19%