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Share-based Compensation - Options Valuation (Details) - Stock options - $ / shares
3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Assumptions used to estimate fair values    
Risk-free interest rate (as a percent) 1.90% 2.90%
Expected volatility (as a percent) 73.70% 58.40%
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
Weighted average fair value (in dollars per share) $ 4.04 $ 6.52