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Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Sep. 30, 2018
Inventory Disclosure [Abstract]    
Purchased parts and raw materials $ 11,902 $ 10,989
Work-in-process 4,449 4,159
Finished goods 2,921 2,687
Inventory $ 19,272 $ 17,835