Revenue Recognition (Tables)

12 Months Ended

Sep. 30, 2022

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 fiscal years ended September 30, 2022, 2021 and 2020 (dollars in thousands):

	Year Ended September 30,
	2022		2021		2020
Revenues:
United States	$	100,564	$	135,033	$	129,338
Other Americas		99		175		16
Germany		74,550		114,936		100,674
Other Europe, Middle East and Africa		15,579		29,964		25,394
Japan		74,480		62,840		50,936
Other Asia-Pacific		62,619		44,234		24,609
Total net revenues	$	327,891	$	387,182	$	330,967

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, 2020	$	30,277
Revenues recognized but not billed		89,217
Amounts reclassified to accounts receivable, net		(60,351	)
Balance as of September 30, 2021	$	59,143
Revenues recognized but not billed		96,409
Amounts reclassified to accounts receivable, net		(67,765	)
Foreign exchange impact on ending balance		(11,495	)
Balance as of September 30, 2022	$	76,292

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

	Deferred revenue
Balance as of September 30, 2020	$	324,729
Amounts billed but not recognized		105,540
Revenue recognized		(153,532	)
Balance as of September 30, 2021	$	276,737
Amounts billed but not recognized		96,165
Revenue recognized		(130,770	)
Foreign exchange impact on ending balance		(3,498	)
Balance as of September 30, 2022	$	238,634

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 September 30, 2022 (dollars in thousands):

	Within One Year		Two to Five Years		Greater than Five Years		Total
Total revenue	$	157,549	$	145,949	$	19,957	$	323,455