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Property and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Summary of property and equipment
   2018   2017 
Plant and machinery  $1,770,626   $2,461,719 
Automobiles   139,380    147,310 
Office and computer equipment   37,005    51,034 
Total property and equipment   1,947,011    2,660,063 
Less: Accumulated depreciation   (685,518)   (2,128,596)
Property and equipment, net  $1,261,493   $531,467