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Inventory (Tables)
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current As of December 31, 2018, the Company's inventory balance consists of the following (in thousands):
 
As of December 31,
2018
Raw materials
$
2,145

Work-in-process
4,567

Finished goods
320

 
$
7,032