Weighted Average Shares Outstanding and Net Loss Per Share - Summary of Reconciliation of Weighted Average Shares Outstanding Used in Calculating Basic and Diluted Net Loss Per Share (Parenthetical) (Details) shares in Millions	3 Months Ended
	Sep. 30, 2018 shares
Earnings Per Share Diluted [Line Items]
Antidilutive shares excluded from calculating diluted net loss per share	1.1
8.0 % Convertible Notes [Member]
Earnings Per Share Diluted [Line Items]
Debt instrument, interest rate, stated percentage	8.00%