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Inventories
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories
 
Inventories consist of the following: 
 
June 30, 2017
 
December 31, 2016
Purchased components
$
772,720

 
$
466,906

Work in progress
—

 
154,971

Finished goods
704,607

 
630,361

 
$
1,477,327

 
$
1,252,238