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Share-Based Compensation - Weighted Average Assumptions (Details) - year
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Share-based payment arrangements [Abstract]    
Risk-free annual interest rate 0.88% 1.81%
Expected annual dividend yield 0.00% 0.00%
Expected stock price volatility 89.60% 81.37%
Expected life of options (years) 2.37 2.96
Forfeiture rate 12.54% 4.17%