Goodwill, Intangible Assets and Acquisitions - Changes in the Group's Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Changes in the Group's goodwill by segment      
Balance at the beginning of the year $ 61,712 $ 28,989 $ 29,346
Currency translation adjustment 2,914 2,648 (357)
Balance at the end of the year 130,405 61,712 28,989
JM Tech      
Changes in the Group's goodwill by segment      
Acquisition   30,075  
Wuta application      
Changes in the Group's goodwill by segment      
Acquisition 51,034    
An E-sports team      
Changes in the Group's goodwill by segment      
Acquisition 14,745    
Advertising & Marketing      
Changes in the Group's goodwill by segment      
Balance at the beginning of the year 30,899 28,989 29,346
Currency translation adjustment 1,813 1,910 (357)
Balance at the end of the year 83,746 30,899 28,989
Advertising & Marketing | JM Tech      
Changes in the Group's goodwill by segment      
Acquisition   0  
Advertising & Marketing | Wuta application      
Changes in the Group's goodwill by segment      
Acquisition 51,034    
Advertising & Marketing | An E-sports team      
Changes in the Group's goodwill by segment      
Acquisition 0    
Value-added services      
Changes in the Group's goodwill by segment      
Balance at the beginning of the year 30,813 0 0
Currency translation adjustment 1,101 738 0
Balance at the end of the year 46,659 30,813 $ 0
Value-added services | JM Tech      
Changes in the Group's goodwill by segment      
Acquisition   $ 30,075  
Value-added services | Wuta application      
Changes in the Group's goodwill by segment      
Acquisition 0    
Value-added services | An E-sports team      
Changes in the Group's goodwill by segment      
Acquisition $ 14,745