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Intangible Assets, Net (Tables)
12 Months Ended
Dec. 31, 2020
Intangible Assets, Net [Abstract]  
Schedule of intangible assets

   December 31,   December 31, 
   2019   2020 
Computer software at cost  $30,648    32,686 
Accumulated amortization   (15,470)   (20,879)
   $15,178    11,807