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Summary of Significant Accounting Policies (Schedule of Available-for-sale Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   $ 33,145
Available-for-sale Securities   33,259
Unrealized Holding Gains   114
Unrealized Holding Losses   0
Money market funds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 4,770 567
Available-for-sale Securities 4,770 567
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
Available-for-sale Securities   32,692
Unrealized Holding Gains   114
Unrealized Holding Losses   0
Cash Equivalents    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4,770 567
Available-for-sale Securities 4,770 567
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
Available-for-sale Securities   32,692
Unrealized Holding Gains   114
Unrealized Holding Losses   $ 0