The components of our property, plant and equipment are summarized below (in thousands):

 

 

 

 

 

 

 

 

 

 

As of December 31, 

 

 

    

2016

    

2015

 

Property, plant and equipment:

 

 

 

 

 

 

 

Machinery and equipment, at cost

 

$
41,254

 

$
40,899

 

Less: accumulated depreciation and amortization

 

 
(37,311)

 

 
(36,044)

 

Building, at cost

 

 
29,600

 

 
30,388

 

Less: accumulated depreciation and amortization

 

 
(9,654)

 

 
(9,170)

 

Leasehold improvements, at cost

 

 
4,942

 

 
5,059

 

Less: accumulated depreciation and amortization

 

 
(3,608)

 

 
(3,306)

 

Construction in progress

 

 
2,582

 

 
3,596

 

 

 

$
27,805

 

$
31,422