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Inventory (Tables)
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Components of Inventories
Inventories consisted of the following at December 31 (in thousands):

 
2018
2017
Raw materials
$
4,064

$
4,220

Work in process
495

377

Finished goods
3,187

3,466

Inventory, net
$
7,746

$
8,063