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Inventory (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Inventory
Inventory consists of the following (in thousands):
 
June 30, 2019
 
December 31, 2018
Raw materials
$
1,757

 
$
1,846

Work-in-process
6,961

 
6,403

Finished goods
4,470

 
3,132

Total inventory
$
13,188

 
$
11,381