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Inventories
 3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Inventories

Note 6.   Inventories

 

Inventories, net of inventory writedowns, consist of the following for the periods indicated (in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

    

March 31, 2018

    

December 31, 2017

 

Raw materials

 

$

32,454

 

$

26,648

 

Work in process and sub-assemblies

 

 

42,353

  

 

31,060

 

Finished goods

 

 

17,817

  

 

18,060

 

 

 

$

92,624

 

$

75,768

 

 

The lower of cost or market adjustment expensed for inventory for the three months ended March 31, 2018 and 2017 was $0.9 million and $0.5 million, respectively.