Goodwill and Other Intangible Assets - Schedule of Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Sep. 30, 2018
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 5,008	$ 5,008	$ 5,008
Total other intangible assets	11,919		11,918
Accumulated amortization	(2,289)		(1,855)
Other intangible assets, net	$ 9,630	$ 10,063	10,063
Weighted-Average Remaining Useful Lives (in years)	9 years 9 months 18 days
Developed Technology
Goodwill And Other Intangible Assets [Line Items]
Total other intangible assets	$ 5,919		5,918
Weighted-Average Remaining Useful Lives (in years)	16 years 8 months 12 days
Customer Relationships
Goodwill And Other Intangible Assets [Line Items]
Total other intangible assets	$ 3,900		3,900
Weighted-Average Remaining Useful Lives (in years)	2 years 8 months 12 days
Trade Names
Goodwill And Other Intangible Assets [Line Items]
Total other intangible assets	$ 1,930		1,930
Weighted-Average Remaining Useful Lives (in years)	3 years 8 months 12 days
Non-compete Agreements
Goodwill And Other Intangible Assets [Line Items]
Total other intangible assets	$ 170		$ 170
Weighted-Average Remaining Useful Lives (in years)	2 years 8 months 12 days