Net Loss Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share Basic And Diluted [Abstract]
Net loss	$ (25,853)	$ (46,792)	$ (1,744)
Weighted-average shares used in per share calculation - basic and diluted	117,954	114,221	108,273
Net loss per share - basic and diluted	$ (0.22)	$ (0.40)	$ (0.02)