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Construction in Progress (Tables)
 6 Months Ended
Jun. 30, 2019
Construction in Progress [Abstract]  
Schedule of construction in progress
   December 31,   June 30, 
   2018   2019 
Construction in progress  $23,562,557   $21,368,952 
Prepayment for acquisition of property, plant and equipment   1,439,256    158,086 
Carrying amount  $25,001,813   $21,527,038