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Geographic and Customer Information (Tables)
9 Months Ended
Sep. 30, 2018
Significant Customer Information [Abstract]  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
The following table summarizes sales, and percentages of sales, by customers that individually accounted for 10% or more of our sales for the three and nine months ended September 30, 2018 and 2017:
 
Three Months Ended September 30,
 
2018
 
% of Total Sales
 
2017
 
% of Total Sales
Applied Materials, Inc.
$
60,546

 
35.0
%
 
$
50,078

 
28.4
%
LAM Research
19,878

 
11.5
%
 
46,315

 
26.2
%
 
Nine Months Ended September 30,
 
2018
 
% of Total Sales
 
2017
 
% of Total Sales
Applied Materials, Inc.
$
198,159

 
35.1
%
 
$
165,239

 
33.6
%
LAM Research
92,368

 
16.4
%
 
114,325

 
23.2
%
The following table summarizes the accounts receivable balances, and percentages of the total accounts receivable, for customers that individually accounted for 10% or more of accounts receivable as of September 30, 2018 and December 31, 2017:
 
September 30,
 
December 31,
 
2018
 
2017
Applied Materials, Inc.
$
42,896

 
38.8
%
 
$
36,755

 
42.0
%
LAM Research
11,707

 
10.6
%
 
5,421

 
6.2
%