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Major Customers and Concentrations of Credit Risk (Tables)
 12 Months Ended
Dec. 31, 2017
Risks and Uncertainties [Abstract]  
Schedule of Concentration Risk by Major Customers
Net revenues from our top ten customers, including The Boeing Company (“Boeing”), Lockheed Martin Corporation (“Lockheed Martin”), Raytheon Company (“Raytheon”), Spirit AeroSystems Holdings, Inc. (“Spirit”), and United Technologies Corporation (“United Technologies”), represented the following percentages of total net sales:

 
 
Years Ended December 31,
 
 
2017
 
2016
 
2015
Boeing
 
16.4
%
 
17.3
%
 
16.0
%
Lockheed Martin
 
5.5
%
 
5.6
%
 
1.2
%
Raytheon
 
13.5
%
 
8.4
%
 
8.7
%
Spirit
 
8.2
%
 
8.2
%
 
7.4
%
United Technologies
 
4.7
%
 
5.3
%
 
6.1
%
Top ten customers (1)
 
62.5
%
 
58.6
%
 
55.7
%

(1) Includes Boeing, Raytheon, Spirit, and United Technologies for 2017, 2016, and 2015 and Lockheed Martin for 2017 and 2016.
Boeing, Lockheed Martin, Raytheon, Spirit, and United Technologies represented the following percentages of total accounts receivable:
 
 
December 31,
 
 
2017
 
2016
Boeing
 
7.8
%
 
7.8
%
Lockheed Martin
 
5.9
%
 
2.9
%
Raytheon
 
1.4
%
 
10.9
%
Spirit
 
13.5
%
 
9.0
%
United Technologies
 
2.3
%
 
7.8
%