Marketable Securities (Details) - U.S. corporate bonds - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015
Short-term Marketable Securities
Marketable Securities
Fair Value	$ 51,757	$ 59,197
Cost	51,756	59,223
Unrealized Gain	14	8
Unrealized Loss	(13)	(34)
Long-term Marketable Securities
Marketable Securities
Fair Value	0	3,047
Cost	0	3,055
Unrealized Gain	0	0
Unrealized Loss	$ 0	$ (8)