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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consisted of the following (in thousands):
 
Estimated
Useful Life
(in years)
 
As of December 31,
 
 
2017
 
2016
Automobiles
5
to
6
 
$
23

 
$
139

Leasehold improvements
4
to
20
 
3,542

  
3,388

Computer software and equipment
3
to
7
 
17,024

  
25,899

Machinery and equipment
3
to
5
 
15,178

  
13,085

Furniture and fixtures
5
to
20
 
2,295

  
2,238

Work in progress (1)
N/A
 
1,052

  
768

Total cost
 
 
 
 
39,114

  
45,517

Accumulated depreciation
 
 
 
 
(23,287
)
  
(28,049
)
 
 
 
 
 
$
15,827

  
$
17,468

(1) Work in progress primarily includes production tooling and equipment and information technology assets.

Depreciation expense was as follows (in thousands):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Depreciation expense
$
5,387

 
$
4,320

 
$
2,558