Revenue Recognition (Tables)

3 Months Ended

Dec. 31, 2021

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 months ended December 31, 2021 and 2020 (dollars in thousands):

	Three Months Ended December 31,
	2021		2020
Revenues:
United States	$	35,129	$	32,094
Other Americas		2		43
Germany		19,509		32,044
Other Europe, Middle East and Africa		3,963		3,469
Japan		26,076		12,673
Other Asia-Pacific		9,747		13,320
Total net revenues	$	94,426	$	93,643

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, 2021	$	59,143
Revenues recognized but not billed		36,425
Amounts reclassified to accounts receivable, net		(18,087	)
Balance as of December 31, 2021	$	77,481

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

	Deferred revenue
Balance as of September 30, 2021	$	276,737
Amounts billed but not recognized		23,881
Revenue recognized		(35,960	)
Balance as of December 31, 2021	$	264,658

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 December 31, 2021 (dollars in thousands):

	Within One Year		Two to Five Years		Greater than Five Years		Total
Total revenue	$	125,457	$	163,626	$	20,298	$	309,381