Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment.  
Property, Plant and Equipment

5.  Property, Plant and Equipment

 

Property, plant and equipment at December 31, 2016 and 2015 consist of the following (in thousands):

 

 

 

 

 

 

 

 

 

 

    

December 31,

    

December 31,

 

 

 

2016

 

2015

 

Land

 

$
90

 

$
90

 

Buildings

 

 
15,332

 

 
15,332

 

Building improvements

 

 
5,221

 

 
5,169

 

Software, machinery and equipment

 

 
17,269

 

 
14,634

 

 

 

 
37,912

 

 
35,225

 

Less: accumulated depreciation

 

 
(29,666)

 

 
(27,970)

 

Property, plant, and equipment, net

 

$
8,246

 

$
7,255

 

 

Depreciation expense related to property, plant and equipment was $1.8 million, $1.5 million, and $1.4 million for the years ended December 31, 2016, 2015 and 2014, respectively.