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Acquisition - Pro Forma Information (Details) - Systron Donner Inertial, Inc. - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]    
Revenue $ 25,482 $ 32,395
Net loss $ (1,335) $ (6,684)
Net loss per basic share (USD per share) $ (0.05) $ (0.24)
Weighted-average number of basic shares outstanding (shares) 28,832 27,534