Accounts Receivable (Schedule of Components of Accounts Receivable) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Sep. 30, 2018
Receivables [Abstract]
Accounts receivable, gross	$ 18,746	$ 19,823
Allowance for doubtful accounts	(295)	(548)
Accounts receivable, net	$ 18,451	$ 19,275

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant