v3.26.1
REDEEMABLE NONCONTROLLING INTEREST AND A LONG TERM BORROWING (Details)
¥ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2023
CNY (¥)
agreement
Dec. 31, 2023
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2025
USD ($)
installment
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2026
CNY (¥)
Jun. 30, 2025
CNY (¥)
Jun. 30, 2024
CNY (¥)
Dec. 31, 2023
USD ($)
agreement
Dec. 26, 2018
USD ($)
Noncontrolling Interest                      
Investment return in installments | ¥ ¥ 26.2                    
Deemed Dividends Adjustment | $   $ 22,000     $ 22,000            
Number of guarantee agreements | agreement 4                 4  
CASI Wuxi                      
Noncontrolling Interest                      
Equity ownership (as a percent)     20.00%               80.00%
Investment commitment | $                     $ 80,000,000
Initial cash investment | $           $ 31,000,000          
Value of transfer of selected ANDAs | $       $ 30,000,000   $ 30,000,000          
Payments to acquire investments | $     $ 20,000,000 $ 20,000,000              
Call option purchase investment period       5 years              
CASI Wuxi | Call option                      
Noncontrolling Interest                      
Equity ownership (as a percent)       20.00%              
CASI Wuxi | Put option                      
Noncontrolling Interest                      
Equity ownership (as a percent)       20.00%              
CASI Wuxi                      
Noncontrolling Interest                      
Payments to acquire investments | $       $ 20,000,000              
Investment principal returned | ¥ ¥ 134.2                    
Reduction in capital | ¥ ¥ 134.2                    
CASI Wuxi | Convertible loan                      
Noncontrolling Interest                      
Loan term 3 years 3 years                  
Loan, conversion term (in years) 6 months 6 months                  
Interest rate (as a percent) 4.05%                 4.05%  
WUXI LP                      
Noncontrolling Interest                      
Investment principal | $                   $ 20,000,000  
Number of installments in which investment is paid | installment       4              
Dividend payable, installment one | ¥ ¥ 5.2                    
Dividend payable, installment two | ¥                 ¥ 5.2    
Dividend payable, installment three | ¥               ¥ 7.9      
WUXI LP | Subsequent event                      
Noncontrolling Interest                      
Dividend payable, installment four | ¥             ¥ 7.9