Income Taxes - Schedule of Changes in Deferred Tax Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2020	Sep. 30, 2019
Deferred Tax Valuation Allowance [Roll Forward]
Balance at the beginning of the year	$ 23,900	$ 23,769
(Reductions) additions to valuation allowance	(2,167)	131
Balance at the end of the year	$ 21,733	$ 23,900

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant