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Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Components of Inventory

Inventories consist of the following (in thousands):

 

 

 

December 31,

 

 

 

2017

 

 

2016

 

Raw materials

 

$

572

 

 

$

—

 

Work-in-process

 

 

1,273

 

 

 

2,120

 

Finished goods

 

 

812

 

 

 

211

 

Total inventory

 

$

2,657

 

 

$

2,331