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Acquisition - Pro Forma Information (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Business Acquisition [Line Items]                      
Weighted-average number of basic and diluted shares outstanding (in shares) 28,734 28,005 27,652 27,534 27,424 27,387 27,197 27,032 27,983 27,266 26,659
Systron Donner Inertial, Inc.                      
Business Acquisition [Line Items]                      
Revenue                 $ 107,199 $ 113,398  
Net loss                 $ (42,013) $ (18,136)  
Net loss per basic share (USD per share)                 $ (1.50) $ (0.67)  
Net loss per diluted share (USD per share)                 $ (0.97) $ (0.42)  
Weighted-average number of diluted shares outstanding (shares)                 27,983 27,266