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Inventories
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories consisted of the following:
 
As of March 31, 2020
 
As of December 31, 2019
 
(in thousands)
Raw materials
$
24,835

 
$
26,247

Work-in-process
117,427

 
107,021

Finished goods
44,825

 
34,234

Total
$
187,087

 
$
167,502