Property and Equipment, Net

12 Months Ended

Dec. 31, 2017

Property Plant And Equipment [Abstract]

Property and Equipment, Net

5. Property and Equipment, net

Property and equipment consists of the following (dollars in thousands):

	Estimated Useful Life	December 31,
	(Years)	2017			2016
Machinery and equipment	3-10	$	12,358		$	8,628
Furniture and fixtures	3-5		1,083			1,190
Computer equipment and software	3-5		628			538
Buildings	Up to 39		7,995			7,310
Land	Indefinite		513			469
Construction in-process			1,133			1,567
			23,710			19,702
Less: Accumulated depreciation			(8,481	)		(6,336	)
Total		$	15,229		$	13,366

Depreciation expense was $1.9 million, $1.5 million and $1.5 million for each of the years ended December 31, 2017, 2016 and 2015, respectively.    

The net book value of property and equipment subject to lien under the debt agreement is $7.4 million and $5.5 million as of December 31, 2017 and 2016, respectively.