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Marketable Securities
 12 Months Ended
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
Marketable Securities
The amortized cost and fair value of marketable securities as of September 30, 2018 and 2017 were as follows:
 
September 30, 2018
 
Amortized cost
 
Gross unrealized gains
 
Gross unrealized losses
 
Fair value
 
(in thousands)
Certificates of deposit
$
220

 
$
—

 
$
(1
)
 
$
219

Corporate notes/bonds
55,140

 
—

 
(403
)
 
54,737

U.S. government agency securities
1,004

 
—

 
(9
)
 
995

 
$
56,364

 
$
—

 
$
(413
)
 
$
55,951

 
September 30, 2017
 
Amortized cost
 
Gross unrealized gains
 
Gross unrealized losses
 
Fair value
 
(in thousands)
Certificates of deposit
$
240

 
$
—

 
$
—

 
$
240

Corporate notes/bonds
47,811

 
2

 
(140
)
 
47,673

U.S. government agency securities
2,407

 
—

 
(5
)
 
2,402

 
$
50,458

 
$
2

 
$
(145
)
 
$
50,315


The following tables summarize the fair value and gross unrealized losses aggregated by category and the length of time that individual securities have been in a continuous unrealized loss position as of September 30, 2018 and 2017.
 
September 30, 2018
 
Less than twelve months
 
Greater than twelve months
 
Total
 
Fair Value
 
Gross unrealized loss
 
Fair Value
 
Gross unrealized loss
 
Fair Value
 
Gross unrealized loss
 
(in thousands)
Certificates of deposit
$
219

 
$
(1
)
 
$
—

 
$
—

 
$
219

 
$
(1
)
Corporate notes/bonds
24,067

 
(70
)
 
30,670

 
(333
)
 
54,737

 
(403
)
US government agency securities
—

 
—

 
995

 
(9
)
 
995

 
(9
)
 
$
24,286

 
$
(71
)
 
$
31,665

 
$
(342
)
 
$
55,951

 
$
(413
)

 
September 30, 2017
 
Less than twelve months
 
Greater than twelve months
 
Total
 
Fair Value
 
Gross unrealized loss
 
Fair Value
 
Gross unrealized loss
 
Fair Value
 
Gross unrealized loss
 
(in thousands)
Certificates of deposit
$
240

 
$
—

 
$
—

 
$
—

 
$
240

 
$
—

Corporate notes/bonds
15,254

 
(43
)
 
28,885

 
(97
)
 
44,139

 
(140
)
US government agency securities
—

 
—

 
2,402

 
(5
)
 
2,402

 
(5
)
 
$
15,494

 
$
(43
)
 
$
31,287

 
$
(102
)
 
$
46,781

 
$
(145
)

The following table presents our available-for-sale marketable securities by contractual maturity date, as of September 30, 2018 and 2017.
 
September 30, 2018
 
September 30, 2017
 
Amortized cost
 
Fair value
 
Amortized cost
 
Fair value
 
(in thousands)
 
(in thousands)
Due in one year or less
$
25,792

 
$
25,670

 
$
18,274

 
$
18,244

Due after one year through three years
30,572

 
30,281

 
32,184

 
32,071

 
$
56,364

 
$
55,951

 
$
50,458

 
$
50,315