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Inventories (Tables)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventories by Type
Inventories consisted of the following:
As of June 30, 2020As of December 31, 2019
(in thousands)
Raw materials
$30,162  $26,247  
Work-in-process
134,889  107,021  
Finished goods
54,167  34,234  
Total
$219,218  $167,502