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Inventories
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories

Inventories are stated at the lower of cost and net realizable value using the first-in first-out costing method. Inventories as of June 30, 2018 and December 31, 2017 include the costs of material, labor, and factory overhead. Components of inventories consist of the following:

 
June 30,
2018
 
December 31,
2017
Raw materials
$
13,387

 
$
13,347

Work in process
2,812

 
2,137

Finished goods
6,713

 
7,248

 
$
22,912

 
$
22,732