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Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventories by Type
Inventories consisted of the following:
 
As of June 30, 2019
 
As of December 31, 2018
 
(in thousands)
Raw materials
$
12,957

 
$
9,677

Work-in-process
91,874

 
87,944

Finished goods
38,186

 
26,739

Total
$
143,017

 
$
124,360