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Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventories by Type
Inventories consisted of the following:
 
As of December 31,
 
2019
 
2018
 
(in thousands)
Raw materials
$
26,247

 
$
9,677

Work-in-process
107,021

 
87,944

Finished goods
34,234

 
26,739

Total
$
167,502

 
$
124,360