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Inventory (Tables)
 3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Inventory
Inventory consisted of the following items (in thousands):
 
March 31, 2019
 
December 31, 2018
Raw materials
$
473

 
$
516

Work in process
11,139

 
11,123

Finished goods
5,357

 
4,936

 Inventory, gross
16,969

 
16,575

Reserve for obsolescence
(541
)
 
(589
)
 Inventory, net
$
16,428

 
$
15,986