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Revenue Recognition (Tables)

6 Months Ended

Mar. 31, 2023

Revenue from Contract with Customer [Abstract]

Summary of Revenues Classified by Major Geographic Region

Revenues, classified by the major geographic region in which our customers are located, for the three and six months ended March 31, 2023 and 2022 (dollars in thousands):

		Three Months Ended March 31,								Six Months Ended March 31,
		2023				2022				2023				2022
Revenues:
United States		$	21,742			$	21,955			$	43,098			$	57,084
Other Americas			28				35				54				37
Germany			24,627				23,131				42,791				42,640
Other Europe, Middle East and Africa			3,512				2,567				7,184				6,530
Japan			5,738				25,413				31,579				51,489
Other Asia-Pacific			12,746				13,179				27,345				22,926
Total net revenues		$	68,393			$	86,280			$	152,051			$	180,706

Summary of Significant Changes in Contract Assets and Deferred Revenue

The table below shows significant changes in contract assets (dollars in thousands):

		Contract assets
Balance as of September 30, 2022		$	76,292
Revenues recognized but not billed			21,955
Amounts reclassified to Accounts receivable, net			(33,375	)
Effect of foreign currency translation			6,591
Balance as of March 31, 2023		$	71,463

The table below shows significant changes in deferred revenue (dollars in thousands):

		Deferred revenue
Balance as of September 30, 2022		$	238,634
Amounts billed but not recognized			42,217
Revenue recognized			(52,377	)
Effect of foreign currency translation			7,743
Balance as of March 31, 2023		$	236,217

Summary of Estimated Revenue Expected to be Recognized in Future Related to Performance Obligations Unsatisfied or Partially Unsatisfied

The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied or partially unsatisfied at March 31, 2023 (dollars in thousands):

		Within One Year				Two to Five Years				Greater than Five Years				Total
Total revenue		$	155,413			$	141,968			$	24,187			$	321,568

X

- Definition

Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130551-203045

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- Definition

Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045

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- References

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- Definition

Tabular disclosure of expected timing for satisfying remaining performance obligation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130556-203045

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