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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Statement of Comprehensive Income [Abstract]      
Net loss $ (19,260) $ (11,615) $ (39,187)
Other comprehensive (loss) income:      
Defined benefit pension plan—unrecognized amounts, net of taxes           (540) 773 1,589
Foreign currency translation (984) (791) 551
Other comprehensive (loss) income, net of taxes (1,524) (18) 2,140
Comprehensive loss $ (20,784) $ (11,633) $ (37,047)