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Property, Plant and Equipment, Net
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment, Net  
Property, Plant and Equipment, Net

Note 5. Property, Plant and Equipment, Net

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

 

 

 

 

 

 

 

 

 

 

December 31, 

 

December 31, 

 

 

 

2017

 

2016

 

Property, plant and equipment:

 

 

 

 

 

 

 

Machinery and equipment, at cost

 

$

44,549

 

$

41,254

 

Less: accumulated depreciation and amortization

 

 

(40,845)

 

 

(37,311)

 

Building, at cost

 

 

32,461

 

 

29,600

 

Less: accumulated depreciation and amortization

 

 

(11,501)

 

 

(9,654)

 

Leasehold improvements, at cost

 

 

5,539

 

 

4,942

 

Less: accumulated depreciation and amortization

 

 

(4,288)

 

 

(3,608)

 

Construction in progress

 

 

20,615

 

 

2,582

 

 

 

$

46,530

 

$

27,805

 

 

As of December 31, 2017, the balance of construction in process was $20.6 million, of which, $14.8 million was for our buildings in our new Dingxing location, $3.6 million was for manufacturing equipment purchases not yet placed in service, and $2.2 million was for our construction in process at our other consolidated subsidiaries. Depreciation and amortization expense was $4.4 million, $4.9 million and $5.5 million for the years ended 2017, 2016, and 2015 respectively.