Net Loss Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share Basic And Diluted [Abstract]
Net loss	$ (6,932)	$ (13,613)	$ (8,798)	$ (41,160)
Weighted-average shares used in per share calculation - basic and diluted	117,944	115,059	117,619	113,641
Net loss per share - basic and diluted	$ (0.06)	$ (0.12)	$ (0.07)	$ (0.36)