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Inventories (Tables)
 12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following items as of (in thousands):
 
December 31,
 
2018
 
2017
Raw materials
$
516

 
$
644

Work in process
11,123

 
4,685

Finished goods
4,936

 
4,905

Inventory, gross
16,575

 
10,234

Reserve for obsolescence
(589
)
 
(767
)
Inventory, net
$
15,986

 
$
9,467