Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Receivables [Abstract]
Trade receivables	$ 16,741	$ 17,791
Less: long-term receivable recorded in other assets	(1,934)	(2,209)
Other receivables	74	103
Allowance for doubtful accounts	(754)	(1,383)
Total accounts receivable, net	$ 14,127	$ 14,302