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Inventories (Tables)
 9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Summary of Inventories
The following table is a summary of inventories (in thousands):

September 30, 2018
 
December 31, 2017
Raw materials and subassemblies
$
20,910

 
$
20,448

Work-in-process
1,070

 
1,146

Finished goods
7,986

 
7,953

Reserve for excess and obsolete inventories
(14,837
)
 
(15,039
)
Total
$
15,129

 
$
14,508