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DEBT - Convertible Senior Notes (Details)
$ / shares in Units, ¥ in Thousands
12 Months Ended
May 12, 2020
CNY (¥)
May 12, 2020
USD ($)
Dec. 31, 2023
CNY (¥)
shares
Dec. 31, 2021
CNY (¥)
Nov. 01, 2022
USD ($)
May 26, 2020
USD ($)
May 12, 2020
USD ($)
$ / shares
Nov. 03, 2017
USD ($)
DEBT                
Amount converted | ¥     ¥ 0          
2022 Notes                
DEBT                
Amount converted | ¥       ¥ 0        
Convertible Debt | 2022 Notes                
DEBT                
Aggregate principal amount               $ 475,000,000
Fixed interest rate (as a percent)               0.375%
Notes redeemed         $ 475,000,000      
Convertible Debt | 2026 Notes                
DEBT                
Aggregate principal amount             $ 450,000,000  
Additional aggregate maximum amount of notes to purchase           $ 50,000,000    
Fixed interest rate (as a percent) 3.00%           3.00%  
Proceeds from issuance of debt ¥ 3,499,000 $ 493,000,000            
Debt issuance costs ¥ 49,000           $ 7,000,000  
Initial conversion price | $ / shares             $ 23.971  
Increment used for debt conversion   $ 1,000            
Repurchase price as a percentage of principal amount 100.00% 100.00%            
Initial conversion rate per ADS 41.72 41.72            
Debt conversion in value | ¥     ¥ 10          
Convertible Debt | 2026 Notes | ADSs                
DEBT                
Debt conversion in shares | shares     24