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Inventories - (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Components of Inventories
Inventories consisted of the following (in thousands): 
 
June 30,
2019
 
December 31,
2018
Raw materials
$
14,893

 
$
10,895

Work in process
29,185

 
20,743

Finished goods
24,921

 
21,318

Total inventories
$
68,999

 
$
52,956