Summary of Significant Accounting Policies (Schedule of Available-for-sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 33,145	$ 164,363
Fair Value	33,259	164,095
Unrealized Holding Gains	114	126
Unrealized Holding Losses	0	(394)
Cash Equivalents
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	567	54,285
Fair Value	567	54,285
Unrealized Holding Gains	0	0
Unrealized Holding Losses	0	0
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	32,578	42,994
Fair Value	32,692	43,034
Unrealized Holding Gains	114	44
Unrealized Holding Losses	0	(4)
Marketable Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0	67,084
Fair Value	0	66,776
Unrealized Holding Gains	0	82
Unrealized Holding Losses	0	(390)
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	567	54,285
Fair Value	567	54,285
Unrealized Holding Gains	0	0
Unrealized Holding Losses	0	0
U.S. Corporate Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	32,578	110,078
Fair Value	32,692	109,810
Unrealized Holding Gains	114	126
Unrealized Holding Losses	0	(394)
U.S. Government Agency Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		0
Fair Value		0
Unrealized Holding Gains		0
Unrealized Holding Losses		0
U.S. Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		0
Fair Value		0
Unrealized Holding Gains		0
Unrealized Holding Losses		$ 0