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Deferred Government Grants (Tables)
 9 Months Ended
Sep. 30, 2020
Deferred Government Grants [Abstract]  
Schedule of deferred government grants
   December 31,   September 30, 
   2019   2020 
Total government grants  $4,260,833   $7,205,668 
Less: Current portion   (142,026)   (3,091,153)
Non-current portion  $4,118,807   $4,114,515