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Marketable Securities (Tables)
 3 Months Ended
Dec. 31, 2016
Marketable Securities [Abstract]  
Schedule of Marketable Securities
At December 31, 2016 our marketable securities were (in thousands):
 
Amortized
Cost (1)
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value (1)
Current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
$
33,979

 
$
—

 
$
(50
)
 
$
33,929

Commercial paper
13,990

 
—

 
(2
)
 
13,988

Certificates of deposit
4,015

 
7

 
—

 
4,022

Current marketable securities
51,984

 
7

 
(52
)
 
51,939

Non-current marketable securities:
 
 
 
 
 
 
 
Certificates of deposit
3,260

 
15

 
—

 
3,275

Total marketable securities
$
55,244

 
$
22

 
$
(52
)
 
$
55,214

(1)
Included in amortized cost and fair value is purchased and accrued interest of $282.
At September 30, 2016 our marketable securities were (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 marketable securities that have been in a continuous unrealized loss position deemed to be temporary, aggregated by investment category (in thousands):
 
December 31, 2016
 
Less than 12 Months
 
More than 12 Months
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
Corporate bonds
$
31,917

 
$
(49
)
 
$
2,012

 
$
(1
)
Commercial paper
13,988

 
(2
)
 
—

 
—

Total
$
45,905

 
$
(51
)
 
$
2,012

 
$
(1
)
 
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
)