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Cash and cash equivalents and short-term deposit (Tables)
 12 Months Ended
Dec. 31, 2022
Cash and Cash Equivalents and Short-Term Deposit [Abstract]  
Schedule of cash and cash equivalents and short-term deposit
    December 31, 2021     December 31, 2022  
(In thousands)   Original
currency  		     US$
equivalent  		     Original
currency  		     US$
Equivalent  		  
US$     3,195       3,195       6,276       6,276  
RMB     13,433       2,107       27,129       3,895  
JPY     158,479       1,192       448,139       3,370  
HKD     5,791       743       5,411       695  
Others             827               882  
Total             8,064               15,118