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Accounts Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Receivables [Abstract]    
Trade receivables $ 14,906 $ 17,791
Less: long-term receivable recorded in other assets (1,975) (2,209)
Other receivables 70 103
Allowance for doubtful accounts (1,459) (1,383)
Total accounts receivable, net $ 11,542 $ 14,302