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Income Taxes - Provision (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Current tax provision (benefit):      
U.S. Federal $ 0 $ 108 $ (234)
State 453 714 613
Foreign 611 795 (210)
Current income tax expense 1,064 1,617 169
Deferred tax (benefit) expense:      
U.S. Federal 103 (6,796) (592)
State (31) (4,182) (86)
Foreign 64 33 58
Total deferred tax (benefit) expense 136 (10,945) (620)
Total (benefit) provision $ 1,200 $ (9,328) $ (451)