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Marketable Securities (Tables)
 12 Months Ended
Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
Marketable securities at June 30, 2017 consist of the following (in thousands):
 
 
 
Gross
 
Gross
 
 
 
Amortized
 
Unrealized
 
Unrealized
 
 
 
Cost
 
Gain
 
(Loss)
 
Fair Value
U.S. Treasury Bonds
$
35,086

 
$
—

 
$
(24
)
 
$
35,062

Certificate of Deposits
15,298

 
—

 
—

 
15,298

U.S. Government Sponsored Agencies
18,357

 
—

 
(13
)
 
18,344

Corporate Debt Securities
32,692

 
—

 
(33
)
 
32,659

Commercial Paper
10,144

 
1

 
—

 
10,145

 
$
111,577

 
$
1

 
$
(70
)
 
$
111,508

Marketable securities at June 30, 2018 consist of the following (in thousands):
 
 
 
Gross
 
Gross
 
 
 
Amortized
 
Unrealized
 
Unrealized
 
 
 
Cost
 
Gain
 
(Loss)
 
Fair Value
U.S. Treasury Bonds
$
9,641

 
$
—

 
$
(9
)
 
$
9,632

Certificate of Deposits
5,610

 
—

 
—

 
5,610

U.S. Government Sponsored Agencies
6,751

 
—

 
(2
)
 
6,749

Corporate Debt Securities
4,510

 
—

 
(5
)
 
4,505

Commercial Paper
249

 
—

 
—

 
249

 
$
26,761

 
$
—

 
$
(16
)
 
$
26,745
Maturities of Marketable Securities
Maturities of debt securities classified as available-for-sale were as follows at June 30, 2018 (in thousands):

 
 
 
Net
 
 
 
Carrying
 
Fair Value
 
Amount
Due within one year
$
21,745

 
$
21,860

Due after one year through five years
5,000

 
5,009

 
$
26,745

 
$
26,869