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Intangible Assets, Net (Tables)
6 Months Ended
Jun. 30, 2019
Intangible Assets, net [Abstract]  
Schedule of intangible assets
   December 31,   June 30, 
   2018   2019 
Computer software at cost  $31,025   $31,083 
Accumulated amortization   (10,156)   (13,046)
   $20,869   $18,037