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Intangible Assets, net (Tables)
12 Months Ended
Dec. 31, 2018
Intangible Assets, net [Abstract]  
Schedule of intangible assets
   December 31,   December 31, 
   2017   2018 
Computer software at cost  $27,340    31,025 
Accumulated amortization   (7,291)   (10,156)
   $20,049    20,869