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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Beginning Balance $ 178,847 $ 176,587
Other comprehensive income (loss) (941) (138)
Ending Balance 160,970 178,847
Unrealized Gains (Losses) on Available-for-Sale Securities    
Beginning Balance   (82)
Other comprehensive income (loss)   82
Foreign Currency Translation Adjustments    
Beginning Balance (15,757) (15,537)
Other comprehensive income (loss) (941) (220)
Ending Balance (16,698) (15,757)
Accumulated Other Comprehensive Loss    
Beginning Balance (15,757) (15,619)
Other comprehensive income (loss) (941) (138)
Ending Balance $ (16,698) $ (15,757)