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Concentration of Credit Risk and Significant Customers (Tables)
 3 Months Ended
Sep. 30, 2018
Risks and Uncertainties [Abstract]  
Schedules of Concentration of Risk, by Risk Factor
Summarized below are individual customers whose revenue or accounts receivable balances were more than 10% of the respective total consolidated amounts:
 
Three Months Ended September 30,
Percentage of revenue
2018
 
2017
Customer A
27.7
%
 
27.5
%
Customer B
38.0
%
 
33.9
%



 
September 30,
2018
 
June 30,
2018
Percentage of accounts receivable
 
Customer A
18.5
%
 
17.1
%
Customer B
37.9
%
 
35.5
%
Customer C
10.2
%
 
10.6
%