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Inventories
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories consisted of the following:
 
As of March 31, 2019
 
As of December 31, 2018
 
(in thousands)
Raw materials
$
11,649

 
$
9,677

Work-in-process
80,529

 
87,944

Finished goods
44,520

 
26,739

Total
$
136,698

 
$
124,360