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Marketable Securities
 12 Months Ended
Sep. 30, 2019
Marketable Securities [Abstract]  
MARKETABLE SECURITIES
MARKETABLE SECURITIES
Our marketable securities historically consist of certificates of deposit, commercial paper, corporate bonds and government municipal bonds. At September 30, 2019 we did not hold any 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.
7. MARKETABLE SECURITIES (CONTINUED)
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
)