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Property, Plant and Equipment
 6 Months Ended
Jun. 30, 2018
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
 
 
June 30, 2018
 
December 31, 2017
Automobiles
5
to
6
 
$
23

 
$
23

Leasehold improvements
4
to
20
 
3,676

 
3,542

Computer software and equipment
3
to
7
 
16,213

 
17,024

Machinery and equipment
3
to
5
 
15,961

 
15,178

Furniture and fixtures
5
to
20
 
2,792

 
2,295

Work in progress(1)
N/A
 
3,816

 
1,052

Total cost
 
 
 
 
42,481

 
39,114

Accumulated depreciation
 
 
 
 
(24,689
)
 
(23,287
)
Total property, plant and equipment, net
 
 
 
 
$
17,792

 
$
15,827


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

Depreciation expense was as follows (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Depreciation expense
$
1,244

 
$
1,457

 
$
2,873

 
$
2,884