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Revenue Recognition (Tables) | 9 Months Ended
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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 |

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- 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 http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
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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 http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
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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 http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 + Details
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