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Details of Selected Balance Sheet Accounts (Tables)
 9 Months Ended
Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Summary of Inventories
Inventories
The following table is a summary of inventories (in thousands):

September 30, 2017
 
December 31, 2016
Raw materials and subassemblies
$
20,519

 
$
21,454

Work-in-process
1,044

 
2,255

Finished goods
7,392

 
6,581

Reserve for excess and obsolete inventories
(14,691
)
 
(15,049
)
Total
$
14,264

 
$
15,241