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Share-based Compensation - Options Valuation (Details) - Stock options - $ / shares
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Assumptions used to estimate fair values      
Risk-free interest rate (as a percent) 1.90% 2.90% 2.10%
Expected volatility (as a percent) 73.70% 58.40% 57.60%
Expected dividend yield (as a percent) 0.00% 0.00% 0.00%
Forfeiture rate (as a percent)   6.50% 6.50%
Expected term (in years) 5 years 1 month 6 days 5 years 3 months 18 days 5 years 4 months 24 days
Weighted average fair value (in dollars per share) $ 4.00 $ 6.52 $ 11.25