Property and Equipment

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Note 6 Property and Equipment

Property and equipment at December 31, 2018 and 2017 are summarized as follows:

໿



(in thousands)	2018			2017			Useful Life (in years)
Land	$	903		$	903		N/A
Building	12,408			11,276			25-30
Machinery and equipment	151,429			134,666			2-7
Capitalized software	18,357			8,834			3-5
Office furniture and equipment	4,955			4,677			1-5
Leasehold improvements	31,514			29,503			Life of lease ^(a)
Construction in progress	15,083			13,527			N/A
Total property and equipment	234,649			203,386
Less: Accumulated depreciation and amortization	(126,931		)	(105,865		)
Total property and equipment, net	$	107,718		$	97,521


(a)	Leasehold improvements are amortized on a straight-line basis over the shorter of (i) their estimated useful lives and (ii) the estimated or contractual life of the related lease.

The Company includes all depreciation from assets attributable to the generation of revenue in the Cost of Sales line item in the Statement of Operations. Depreciation related to assets that are not attributable to the generation of revenue are included in the Research and Development and Selling and General Administrative line items in the Statement of Operations. Depreciation expense on property and equipment for the years ended 2018, 2017 and 2016 was $29,302, $25,561 and $24,331, respectively.

For the years ended December 31, 2018, 2017 and 2016, the Company recognized impairment charges of $625, $636, and $7,408, respectively, on property and equipment, net.