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Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Nov. 30, 2018
Sep. 30, 2018
Goodwill And Other Intangible Assets [Line Items]        
Goodwill $ 5,980,000     $ 4,343,000
Amortization expense 362,000 $ 0    
Optoseis Technology        
Goodwill And Other Intangible Assets [Line Items]        
Goodwill 5,980,000   $ 1,600,000 4,343,000
Other intangible assets $ 12,719,000   $ 4,500,000 $ 8,200,000