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Summary of Business and Significant Accounting Policies - Concentration of Credit Risk (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2021
USD ($)
customer
Mar. 31, 2020
customer
Mar. 31, 2021
USD ($)
customer
Mar. 31, 2020
customer
Jun. 30, 2020
USD ($)
Concentration of Credit Risk          
Number of customers that accounted for more than ten percent of total revenue | customer 2 2 2 2  
Contract receivables          
Unbilled accounts receivable | $ $ 855   $ 855   $ 1,700
Sales | Customer Concentration Risk | Customer One          
Concentration of Credit Risk          
Concentration risk, percentage 23.00% 18.00% 20.00% 18.00%  
Sales | Customer Concentration Risk | Customer Two          
Concentration of Credit Risk          
Concentration risk, percentage 13.00% 10.00% 12.00% 10.00%