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Marketable Securities (Tables)
 12 Months Ended
Sep. 30, 2017
Marketable Securities [Abstract]  
Schedule of Marketable Securities
At September 30, 2017 our marketable securities consisted of (in thousands):
 
Amortized
Cost (1)
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value (1)
Current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
$
28,275

 
$
—

 
$
(20
)
 
$
28,255

Certificates of deposit
3,756

 
4

 
—

 
3,760

Current marketable securities
32,031

 
4

 
(20
)
 
32,015

Non-current marketable securities:
 
 
 
 
 
 
 
Certificates of deposit
4,757

 
—

 
(4
)
 
4,753

Total marketable securities
$
36,788

 
$
4

 
$
(24
)
 
$
36,768

(1)
Included in amortized cost and fair value is purchased and accrued interest of $211.
At September 30, 2016 our marketable securities consisted of (in thousands):
 
Amortized
Cost (1)
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value (1)
Current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
$
28,801

 
$
—

 
$
(34
)
 
$
28,767

Commercial paper
23,963

 
—

 
(20
)
 
23,943

Certificates of deposit
3,755

 
13

 
—

 
3,768

Government municipal bonds
1,904

 
—

 
—

 
1,904

Current marketable securities
58,423

 
13

 
(54
)
 
58,382

Non-current marketable securities:
 
 
 
 
 
 
 
Certificates of deposit
3,505

 
36

 
—

 
3,541

Total marketable securities
$
61,928

 
$
49

 
$
(54
)
 
$
61,923

(1)
Included in amortized cost and fair value is purchased and accrued interest of $271.
Schedule of Unrealized Losses on Available-for-Sale Securities
The following tables show the fair values and gross unrealized losses of our available-for-sale securities that have been in a continuous unrealized loss position deemed to be temporary, aggregated by investment category (in thousands):
 
September 30, 2017
 
Less than 12 Months
 
More than 12 Months
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
Corporate bonds
$
26,196

 
$
(20
)
 
$
—

 
$
—

Certificates of deposit
3,751

 
(4
)
 
—

 
—

Total
$
29,947

 
$
(24
)
 
$
—

 
$
—

 
September 30, 2016
 
Less than 12 Months
 
More than 12 Months
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
Corporate bonds
$
24,454

 
$
(33
)
 
$
4,102

 
$
(1
)
Commercial paper
23,943

 
(20
)
 
—

 
—

Total
$
48,397

 
$
(53
)
 
$
4,102

 
$
(1
)