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INVESTMENTS - Schedule of investments categorized by investment class (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Cost method and equity method investments      
Cost of equity investments without readily determinable fair value $ 8,612 $ 8,678  
Net amount in accumulated impairment 5,686 5,625  
Impairment recognized 0 132 $ 1,408
Loss (gain) from equity method investments $ (1) (20) $ (295)
Beijing Weisaishidai Sports Technology Co., Ltd      
Cost method and equity method investments      
Impairment recognized   1,408  
Beijing Dark Horse Venture Capital Center. L.P      
Cost method and equity method investments      
Impairment recognized   $ 132