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Long-term investments - Additional Informational (Details) - USD ($)
 1 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Jun. 30, 2023
Long-term investments   $ 40,710,000 $ 43,893,000    
Long-term bank deposits   35,500,000 143,127,000    
Impairment Losses, Investments     6,500,000    
Impairment on equity investments without readily determinable fair value   0      
Impairment on equity method investments   4,100,000      
Equity investees net loss or income   3,500,000 31,600 $ 200,000  
Unrealized gains and interest recorded, convertible bonds   0 1,500,000    
Financial products issued by banks   $ 61,400,000 20,000,000    
Financial products issued by banks original maturity period   over one year      
Financial products issued by banks weighted average maturity period   1 year 8 months 12 days      
Equity Securities, FV-NI, Cost   $ 51,700,000 $ 51,900,000    
Fair value of straight debt $ 4,600,000        
Charge-off to allowance for credit losses $ 1,200,000        
Debt securities, allowance for credit loss         $ 4,600,000