Significant Accounting Policies (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Jun. 30, 2014
Short-term Marketable Securities
Marketable Securities
Fair Value	$ 59,197	$ 67,619
Cost	59,223	67,587
Unrealized Gain	8	39
Unrealized Loss	(34)	(7)
Long-term Marketable Securities
Marketable Securities
Fair Value	3,047	31,270
Cost	3,055	31,290
Unrealized Gain	0	1
Unrealized Loss	(8)	(21)
U.S. corporate bonds | Short-term Marketable Securities
Marketable Securities
Fair Value	59,197	67,619
Cost	59,223	67,587
Unrealized Gain	8	39
Unrealized Loss	(34)	(7)
U.S. corporate bonds | Long-term Marketable Securities
Marketable Securities
Fair Value	3,047	31,270
Cost	3,055	31,290
Unrealized Gain	0	1
Unrealized Loss	$ (8)	$ (21)