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Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Summary of Inventories

Inventories consist of the following:

 

     March 31, 2019      December 31, 2018  

Raw materials

   $ 303,588      $ 235,593  

Work-in-process

     76,560        61,908  

Finished goods

     95,485        87,188  
  

 

 

    

 

 

 
   $ 475,633      $ 384,689