2. Inventories, net (Tables)

12 Months Ended

Dec. 31, 2017

Inventories Net Tables

Schedule of components of inventory

	December 31,
	2017		2016
Finished goods	$	2,825	$	3,216
Work in process		7,111		6,612
Raw materials		4,422		4,171
	$	14,358	$	13,999

Schedule of changes in allowance for obsolete or slow moving inventory

	Years Ended December 31,
	2017			2016
Balance, beginning of year	$	1,607		$	1,685
Charged to cost of sales		149			180
Disposal of inventory		(967	)		(258	)
Balance, end of year	$	789		$	1,607