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Inventories - (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Components of inventories
Inventories consisted of the following (in thousands): 
 
December 31,
 
2019
 
2018
Raw materials
$
13,595

 
$
10,895

Work in process
36,658

 
20,743

Finished goods
28,355

 
21,318

Total inventories
$
78,608

 
$
52,956