Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020
Indefinite Lived Intangible Assets By Major Class [Line Items]
Cost	$ 38,587	$ 38,587
Accumulated Amortization	20,164	19,298
Net	$ 18,423	$ 19,289
Completed technologies
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period	6 years 4 months 24 days	6 years 4 months 24 days
Cost	$ 20,341	$ 20,341
Accumulated Amortization	9,736	9,416
Net	$ 10,605	$ 10,925
Customer relationships
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period	4 years 9 months 18 days	4 years 9 months 18 days
Cost	$ 17,628	$ 17,628
Accumulated Amortization	9,928	9,390
Net	$ 7,700	$ 8,238
Trade names
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period	4 years 6 months	4 years 6 months
Cost	$ 618	$ 618
Accumulated Amortization	500	492
Net	$ 118	$ 126