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

June 30, 2018
 
December 31, 2017
Raw materials and subassemblies
$
19,988

 
$
20,448

Work-in-process
1,476

 
1,146

Finished goods
8,441

 
7,953

Reserve for excess and obsolete inventories
(14,980
)
 
(15,039
)
Total
$
14,925

 
$
14,508