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Inventory (Tables)
 6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Inventory
Inventory consisted of the following (in thousands):
 
June 30, 2019
 
December 31, 2018
Raw materials
$
375

 
$
516

Work in process
9,290

 
11,123

Finished goods
6,376

 
4,936

 Inventory, gross
16,041

 
16,575

Reserve for obsolescence
(1,089
)
 
(589
)
 Inventory, net
$
14,952

 
$
15,986