Goodwill and intangible assets

12 Months Ended

Sep. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and intangible assets

5. Goodwill and intangible assets

There were no changes to the carrying value of goodwill during the years ended September 30, 2020 and 2019. Total amortization expense related to intangible assets were $0.2 million for each of the years ended September 30, 2020, 2019 and 2018.

The intangible assets balances are presented below:

	September 30, 2020
(in thousands, except for years)	Useful lives in years		Gross carrying amount		Accumulated amortization			Net book value
Developed Technology		6	$	1,220	$	(913	)	$	307
Tradenames & Trademarks		2		20		(20	)		—
Total indefinite-lived intangible assets			$	1,240	$	(933	)	$	307

	September 30, 2019
(in thousands, except for years)	Useful lives in years		Gross carrying amount		Accumulated amortization			Net book value
Developed Technology		6	$	1,220	$	(712	)	$	508
Tradenames & Trademarks		2		20		(20	)		—
Total indefinite-lived intangible assets			$	1,240	$	(732	)	$	508

Future annual amortization expense is as follows (in thousands):

Years ending September 30,
2021	$	204
2022		103
	$	307