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Significant Accounting Policies - Research and Development Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Accounting Policies [Abstract]        
Cost, Direct Labor $ 0.1 $ 0.1 $ 0.7 $ 0.1