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Intangible Assets, Net (Tables)
12 Months Ended
Dec. 31, 2019
Intangible Assets, Net [Abstract]  
Schedule of intangible assets
   December 31,   December 31, 
   2018   2019 
Computer software at cost  $31,025    30,648 
Accumulated amortization   (10,156)   (15,470)
   $20,869    15,178