Marketable Securities (Tables)

6 Months Ended

Mar. 31, 2019

Marketable Securities [Abstract]

Debt Securities, Available-for-sale [Table Text Block]

At March 31, 2019 our marketable securities were (in thousands):

	Amortized Cost (1)		Unrealized Gains		Unrealized Losses			Fair Value (1)
Current marketable securities:
Certificates of deposit	$	2,503	$	—	$	(6	)	$	2,497
Total marketable securities	$	2,503	$	—	$	(6	)	$	2,497

(1) Included in amortized cost and fair value is purchased and accrued interest of $3.

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.

Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block]

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):

	March 31, 2019
	Less than 12 Months				More than 12 Months
	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Certificates of deposit	$	—	$	—	$	2,497	$	(6	)
Total	$	—	$	—	$	2,497	$	(6	)

	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	)