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Inventories
12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
(4) Inventories

 

    December 31,  
    2017     2016  
                 
Raw materials and component parts   $ 46,884     $ 36,821  
Finished goods     90,174       60,156  
    $ 137,058     $ 96,977  

 

Overhead included in inventory aggregated $5.0 million and $3.1 million as of December 31, 2017 and 2016, respectively. Included in inventories is an inventory reserve, which represents the difference between the cost of the inventory and its estimated realizable value, based upon sales forecasts and the physical condition of the inventories. In addition, and as necessary, specific reserves for future known or anticipated events may be established. Inventory reserves aggregated $5.4 million as of December 31, 2017 and 2016.