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Marketable Securities (Tables)
12 Months Ended
Sep. 30, 2019
Marketable Securities [Abstract]  
Schedule of Marketable Securities
At September 30, 2018 our marketable securities were (in thousands):
 
Amortized
Cost (1)
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value (1)
Current marketable securities:
 
 
 
 
 
 
 
Certificates of deposit
$
4,756

 
$

 
$
(20
)
 
$
4,736

Total marketable securities
$
4,756

 
$

 
$
(20
)
 
$
4,736

(1)
Included in amortized cost and fair value is purchased and accrued interest of $6.
Schedule of Unrealized Losses on Available-for-Sale Securities
The following table shows 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, 2018
 
Less than 12 Months
 
More than 12 Months
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
Certificates of deposit
$

 
$

 
$
4,736

 
$
(20
)
Total
$

 
$

 
$
4,736

 
$
(20
)