Balance Sheet Accounts (Schedule of Available-for-sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 61,509	$ 164,363
Fair Value	61,622	164,095
Unrealized Holding Gains	113	126
Unrealized Holding Losses	0	(394)
Cash equivalents
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	17,909	54,285
Fair Value	17,909	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	43,600	42,994
Fair Value	43,713	43,034
Unrealized Holding Gains	113	44
Unrealized Holding Losses	0	(4)
Marketable securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		67,084
Fair Value		66,776
Unrealized Holding Gains		82
Unrealized Holding Losses		(390)
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	17,909	54,285
Fair Value	17,909	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	43,600	110,078
Fair Value	43,713	109,810
Unrealized Holding Gains	113	126
Unrealized Holding Losses	$ 0	$ (394)