Revenue Recognition (Tables)

6 Months Ended

Mar. 31, 2020

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, 2020 and 2019 (dollars in thousands):

	Three Months Ended March 31,				Six Months Ended March 31,
	2020		2019		2020		2019
Revenues:
United States	$	36,505	$	29,630	$	71,546	$	67,694
Other Americas		-		278		8		632
Germany		20,102		15,114		40,319		28,830
Other Europe, Middle East and Africa		8,628		5,360		13,225		10,144
Japan		15,518		7,985		26,929		17,738
Other Asia-Pacific		5,742		11,937		11,927		17,750
Total net revenues	$	86,495	$	70,304	$	163,954	$	142,788

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 October 1, 2019	$	9,219
Revenues recognized but not billed		24,624
Amounts reclassified to accounts receivable, net		(16,933	)
Balance as of March 31, 2020	$	16,910

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

	Deferred revenue
Balance as of October 1, 2019	$	353,284
Amounts billed but not recognized		57,648
Revenue recognized		(62,840	)
Balance as of March 31, 2020	$	348,092

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, 2020 (dollars in thousands):

	Within One Year		Two to Five Years		Greater than Five Years		Total
Total revenue	$	162,663	$	196,134	$	54,536	$	413,333