Revenue Recognition (Tables)

9 Months Ended

Jun. 30, 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 and nine months ended June 30, 2021 and 2020 (dollars in thousands):

	Three Months Ended June 30,				Nine Months Ended June 30,
	2021		2020		2021		2020
Revenues:
United States	$	31,632	$	27,969	$	100,507	$	99,907
Other Americas		37		8		105		16
Germany		24,519		21,082		81,230		61,401
Other Europe, Middle East and Africa		10,574		6,868		27,239		20,093
Japan		19,032		11,727		45,484		38,656
Other Asia-Pacific		11,007		7,543		34,541		19,652
Total net revenues	$	96,801	$	75,197	$	289,106	$	239,725

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		58,161
Amounts reclassified to accounts receivable, net		(39,794	)
Balance as of June 30, 2021	$	48,644
Less: allowance for credit losses		(496	)
Balance as of June 30, 2021, net	$	48,148

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		80,683
Revenue recognized		(115,629	)
Balance as of June 30, 2021	$	289,783

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 June 30, 2021 (dollars in thousands):

	Within One Year		Two to Five Years		Greater than Five Years		Total
Total revenue	$	138,003	$	175,677	$	21,959	$	335,639