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Inventory (Tables)
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Components of Inventories
Inventories consisted of the following at September 30, 2019 and December 31, 2018 (in thousands):

 
September 30,
December 31,
 
2019
2018
Raw materials
$
5,088

$
4,064

Work in process
1,604

495

Finished goods
1,189

3,187


$
7,881

$
7,746