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Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventories

Inventories consist of the following:

 

    December 31,  
    2017     2018  
             
Components   $ 1,083,000     $ 2,218,000  
Finished goods, net     3,503,000       2,431,000  
                 
    $ 4,586,000     $ 4,649,000