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LONG-TERM INVESTMENTS, NET - Schedule of equity method investments - Parenthetical (Details)
$ in Thousands, ¥ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Feb. 22, 2017
CNY (¥)
Mar. 18, 2008
LONG-TERM INVESTMENTS, NET          
Equity Method Investments $ 5,083 $ 11,844      
Retained earnings distributed to settle payables 0 0 $ 679    
Beijing Eastern Media Corporation Ltd. ("BEMC ")          
LONG-TERM INVESTMENTS, NET          
Gain (loss) on investment (37) 57 $ 197    
Beijing Eastern Media Corporation Ltd. ("BEMC ") | Parent Company | Reportable Legal Entities          
LONG-TERM INVESTMENTS, NET          
Ownership percentage         51.00%
Beijing Eastern Media Corporation Ltd. ("BEMC ") | China Eastern Media Corporation          
LONG-TERM INVESTMENTS, NET          
Ownership percentage         49.00%
Unicom AirNet          
LONG-TERM INVESTMENTS, NET          
Gain (loss) on investment $ 2,635 $ 2,945      
Ownership percentage       39.00%  
Equity Method Investments | ¥       ¥ 117.9