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Intangible Assets, net (Tables)
6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of intangible assets
   December 31,   June 30, 
   2020   2021 
Computer software at cost  $32,686   $33,042 
Accumulated amortization   (20,879)   (22,484)
   $11,807   $10,558