Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Nov. 30, 2018	Jul. 31, 2018	Jul. 27, 2018
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 5,008,000	$ 4,343,000
Goodwill impairment	0
Other intangible assets impairment	0
Amortization expense	$ 1,661,000	$ 194,000
Optoseis Technology
Goodwill And Other Intangible Assets [Line Items]
Goodwill			$ 700,000
Other intangible assets			$ 3,700,000
Quantum
Goodwill And Other Intangible Assets [Line Items]
Goodwill				$ 4,300,000	$ 4,300,000
Other intangible assets				$ 8,200,000