Property, Plant, and Equipment, Net

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property, plant, and equipment, net were as follows:



	December 31,
(In thousands)	2017			2016
Buildings	$	37,937		$	48,367
Machinery and equipment	57,441			67,726
Tooling	37,191			31,773
Leasehold and building improvements	15,748			22,680
Software	18,240			11,581
Furniture and fixtures	5,620			3,794
Computer equipment	7,154			5,120
	179,331			191,041
Accumulated depreciation	(82,866		)	(101,768		)
	96,465			89,273
Construction in progress	14,497			16,078
Total property, plant, and equipment, net	$	110,962		$	105,351

Depreciation expense, including tooling depreciation which is recorded in cost of goods sold, was $24.4 million, $20.7 million and $15.6 million for the years ended December 31, 2017, 2016, and 2015, respectively.

The net book value of property, plant, and equipment located within the PRC was $93.6 million and $90.0 million on December 31, 2017 and 2016, respectively.

During the fourth quarter of 2017, we performed an impairment analysis over our factory assets in China, which was triggered primarily by the transition of a number of our customers to next generation products. Based on our forecasted future production, we determined that the realizable value of certain tooling and equipment was less than net book value. Accordingly, we recorded an impairment charge of $4.1 million, of which $3.8 million is recorded in cost of goods sold and the remaining $0.3 million is recorded in selling, general and administrative expenses, during the year ended December 31, 2017.

Construction in progress was as follows:



	December 31,
(In thousands)	2017		2016
Buildings	$	—	$	118
Machinery and equipment	3,884		4,625
Tooling	3,697		2,219
Leasehold and building improvements	1,014		1,335
Software	5,714		7,674
Other	188		107
Total construction in progress	$	14,497	$	16,078

We expect that most of the assets under construction will be placed into service during the first six months of 2018. We will begin to depreciate the cost of these assets under construction once they are placed into service.