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Share-Based Compensation - Options Valuation (Details) - Stock options - $ / shares
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Assumptions used to estimate fair values    
Risk-free interest rate (as a percent) 2.90% 1.90%
Expected volatility (as a percent) 58.40% 57.40%
Forfeiture rate (as a percent) 6.50% 6.50%
Expected term (in years) 5 years 3 months 18 days 5 years 4 months 24 days
Weighted average fair value (in dollars per share) $ 6.52 $ 9.06