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Inventories
3 Months Ended
Mar. 31, 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 March 31, 2018 and December 31, 2017 include the costs of material, labor, and factory overhead. Components of inventories consist of the following:
 
March 31,
2018
 
December 31,
2017
Raw materials
$
13,835

 
$
13,347

Work in process
2,926

 
2,137

Finished goods
6,566

 
7,248

 
$
23,327

 
$
22,732