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Inventories
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories consisted of the following (in thousands): 
 
September 30,
2019
 
December 31,
2018
Raw materials
$
11,653

 
$
10,895

Work in process
33,935

 
20,743

Finished goods
25,520

 
21,318

Total inventories
$
71,108

 
$
52,956