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Inventories (Tables)
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventories

Inventories consisted of the following at March 31, 2020 and December 31, 2019:

 

    March 31,
2020
    December 31, 2019  
Raw material and component parts   $ 4,312,384     $ 4,481,611  
Work-in-process     60,862       35,858  
Finished goods     4,881,662       4,906,956  
                 
Subtotal     9,254,908       9,424,425  
Reserve for excess and obsolete inventory     (4,117,022 )     (4,144,013 )
                 
Total   $ 5,137,886     $ 5,280,412