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Segment Information - Reconciliation from Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting [Abstract]
Gross profit	$ 29,038	$ 28,551	$ 29,218	$ 26,473	$ 24,857	$ 27,144	$ 27,511	$ 30,200	$ 113,280	$ 109,712	$ 124,490
Operating expenses									127,739	130,048	161,083
Other operating expenses									5,049	1,392	3,651
Interest (income) expense and other expense, net									(1,448)	(785)	(606)
Loss before provision for income taxes	$ (5,163)	$ (4,107)	$ (4,034)	$ (4,756)	$ (6,547)	$ (3,093)	$ (5,276)	$ (6,027)	$ (18,060)	$ (20,943)	$ (39,638)

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- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1,2)
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The net amount of operating interest income (expense).

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-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
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