Goodwill and Other Intangible Assets - Schedule of Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 5,008	$ 4,343
Other intangible assets, net	10,063	8,006
Optoseis Technology and Quantum
Goodwill And Other Intangible Assets [Line Items]
Goodwill	5,008	4,343
Total other intangible assets	11,918	8,200
Accumulated amortization	(1,855)	(194)
Other intangible assets, net	$ 10,063	8,006
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	4,200
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	2,500
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	1,400
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	$ 100
Weighted-Average Remaining Useful Lives (in years)	3 years