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Marketable Securities (Tables)
 12 Months Ended
Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
The amortized cost and fair value of marketable securities as of September 30, 2019 and 2018 were as follows:
(in thousands)
September 30, 2019
 
Amortized cost
 
Gross unrealized gains
 
Gross unrealized losses
 
Fair value
Commercial paper
999

 
—

 
—

 
999

Corporate notes/bonds
56,318

 
146

 
(28
)
 
56,436

 
$
57,317

 
$
146

 
$
(28
)
 
$
57,435

(in thousands)
September 30, 2018
 
Amortized cost
 
Gross unrealized gains
 
Gross unrealized losses
 
Fair value
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
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]
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, 2019 and 2018.
(in thousands)
September 30, 2019
 
Less than twelve months
 
Greater than twelve months
 
Total
 
Fair Value
 
Gross unrealized loss
 
Fair Value
 
Gross unrealized loss
 
Fair Value
 
Gross unrealized loss
Corporate notes/bonds
$
12,419

 
$
(14
)
 
$
16,369

 
$
(14
)
 
$
28,788

 
$
(28
)

(in thousands)
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
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
)
Investments Classified by Contractual Maturity Date
The following table presents our available-for-sale marketable securities by contractual maturity date, as of September 30, 2019 and 2018.
(in thousands)
September 30, 2019
 
September 30, 2018
 
Amortized cost
 
Fair value
 
Amortized cost
 
Fair value
Due in one year or less
$
27,725

 
$
27,735

 
$
25,792

 
$
25,670

Due after one year through three years
29,592

 
29,700

 
30,572

 
30,281

 
$
57,317

 
$
57,435

 
$
56,364

 
$
55,951