Income Taxes - Schedule of Changes in Deferred Tax Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2019	Sep. 30, 2018
Deferred Tax Valuation Allowance [Roll Forward]
Balance at the beginning of the year	$ 23,769	$ 22,930
Additions to valuation allowance	131	839
Balance at the end of the year	$ 23,900	$ 23,769

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant