Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2013
Cash, cash equivalents and short-term investments
Cash	$ 79,192	$ 91,797
Amortized Cost	54,253
Gross Unrealized Gains	1	72
Gross Unrealized Losses	(69)	(54)
Available-for-sale Securities	54,185
Total Amortized Cost	149,702	171,881
Cash and Cash Equivalents	95,449	92,346	88,013	73,313
Short-term investments	54,185	79,553
Amortized Cost
Due in 1 year or less	40,421
Due in 1-2 years	8,487
Due in 2-3 years	5,345
Amortized cost	54,253
Fair Value
Due in 1 year or less	40,381
Due in 1-2 years	8,469
Due in 2-3 years	5,335
Available-for-sale Securities	54,185
Level 1
Cash, cash equivalents and short-term investments
Cash Equivalents	8,258
Cash Equivalents and Short-term Investments including Available-for-sale Securities	8,258
Level 1 | Money market funds
Cash, cash equivalents and short-term investments
Cash Equivalents	8,258	549
Cash Equivalents and Short-term Investments including Available-for-sale Securities	8,258	549
Level 2
Cash, cash equivalents and short-term investments
Amortized Cost	62,252
Gross Unrealized Losses	(69)
Cash and Cash Equivalents	7,999
Short-term investments	54,185
Amortized Cost
Amortized cost	62,252
Level 2 | Commercial paper
Cash, cash equivalents and short-term investments
Amortized Cost	15,997
Cash and Cash Equivalents	7,999
Short-term investments	7,998
Amortized Cost
Amortized cost	15,997
Level 2 | Agency Securities [Member]
Cash, cash equivalents and short-term investments
Amortized Cost	17,999
Gross Unrealized Gains	1
Short-term investments	18,000
Amortized Cost
Amortized cost	17,999
Level 2 | Foreign Government Debt Securities [Member]
Cash, cash equivalents and short-term investments
Amortized Cost	1,507
Gross Unrealized Losses	(4)
Short-term investments	1,503
Amortized Cost
Amortized cost	1,507
Level 2 | Corporate notes
Cash, cash equivalents and short-term investments
Amortized Cost	26,749	79,535
Gross Unrealized Gains		72
Gross Unrealized Losses	(65)	(54)
Available-for-sale Securities	26,684
Short-term investments		79,553
Amortized Cost
Amortized cost	26,749	79,535
Fair Value
Available-for-sale Securities	$ 26,684