Stock-based Compensation - Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2020 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)	100,000
Exercisable stock options outstanding (in shares)	66,667
Aggregate intrinsic value | $	$ 38
Exercise Price Range 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price (in dollars per share) | $ / shares	$ 1.28
Stock options outstanding (in shares)	50,000
Exercisable stock options outstanding (in shares)	16,667
Remaining contractual life	8 years 3 months
Aggregate intrinsic value | $	$ 32
Exercise Price Range 5
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price (in dollars per share) | $ / shares	$ 1.81
Stock options outstanding (in shares)	50,000
Exercisable stock options outstanding (in shares)	50,000
Remaining contractual life	6 years 5 months 1 day
Aggregate intrinsic value | $	$ 6