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Inventories
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories consisted of the following:
 
As of September 30, 2019
 
As of December 31, 2018
 
(in thousands)
Raw materials
$
21,293

 
$
9,677

Work-in-process
105,667

 
87,944

Finished goods
35,346

 
26,739

Total
$
162,306

 
$
124,360