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Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories consist of the following:
                 
 
June 30, 2019
   
December 31, 2018
 
Raw materials
  $
300,484
    $
235,593
 
Work-in-process
   
82,661
     
61,908
 
Finished goods
   
96,352
     
87,188
 
                 
  $
479,497
    $
384,689