6. Property, Plant and Equipment

9 Months Ended

Sep. 30, 2015

Property, Plant and Equipment [Abstract]

6. Property, Plant and Equipment

Property, plant and equipment consisted of the following for the periods indicated (in thousands):

	September 30, 2015			December 31, 2014
Land improvements	$	863		$	103
Building and improvements		25,938			16,196
Machinery and equipment		76,328			61,529
Furniture and fixtures		2,148			1,938
Computer equipment and software		5,729			4,712
Transportation equipment		262			270
		111,268			84,748
Less accumulated depreciation and amortization		(37,773	)		(32,412	)
		73,495			52,336
Construction in progress		13,240			11,371
Land		1,101			1,101
Property, plant and equipment, net	$	87,836		$	64,808

For the three months ended September 30, 2015 and 2014, depreciation expense of property, plant and equipment was $2.3 million and $1.6 million, respectively. Among them, $1.5 million and $1.0 million were recorded as cost of sales for the three months ended September 30, 2015 and 2014, respectively. For the nine months ended September 30, 2015 and 2014, depreciation expense of property, plant and equipment was $6.4 million and $4.1 million, respectively. Among them, $3.9 million and $2.4 million were recorded as cost of sales for the nine months ended September 30, 2015 and 2014, respectively.