Goodwill and Other Intangible Assets - Schedule of Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 4,337	$ 5,008
Other intangible assets, net	8,331	10,063
Optoseis Technology and Quantum
Goodwill And Other Intangible Assets [Line Items]
Goodwill	4,337	5,008
Total other intangible assets	11,918	11,918
Accumulated amortization	(3,587)	(1,855)
Other intangible assets, net	$ 8,331	10,063
Weighted-Average Remaining Useful Lives (in years)	10 years
Optoseis Technology and Quantum | Developed Technology
Goodwill And Other Intangible Assets [Line Items]
Total other intangible assets	$ 5,918	5,918
Weighted-Average Remaining Useful Lives (in years)	16 years 10 months 24 days
Optoseis Technology and Quantum | 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 10 months 24 days
Optoseis Technology and Quantum | 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 10 months 24 days
Optoseis Technology and Quantum | Non-compete Agreements
Goodwill And Other Intangible Assets [Line Items]
Total other intangible assets	$ 170	$ 170
Weighted-Average Remaining Useful Lives (in years)	3 years