Marketable Securities - (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Jun. 30, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 50,347	$ 86,154
Gross Unrealized Gain	36	50
Gross Unrealized (Loss)	(13)	(38)
Fair Value	50,370	86,166
Certificates of Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,250	6,000
Gross Unrealized Gain	3	4
Fair Value	4,253	6,004
U.S. Treasury Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,949	13,375
Gross Unrealized Gain	2	14
Fair Value	6,951	13,389
U.S. Government Sponsored Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	22,237	40,694
Gross Unrealized Gain	25	30
Gross Unrealized (Loss)	(3)	(9)
Fair Value	22,259	40,715
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	16,911	26,085
Gross Unrealized Gain	6	2
Gross Unrealized (Loss)	(10)	(29)
Fair Value	$ 16,907	$ 26,058