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Revenue Recognition - Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Total revenue | $ 22,067 | $ 17,683
Deposits revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 14,651 | 11,870
Identity verification revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 7,416 | 5,813
Transferred at Point in Time | Deposits software and hardware |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 10,283 | 9,050
Transferred at Point in Time | Identity verification software and hardware |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 1,232 | 945
Transferred over Time | Deposits services and other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 4,368 | 2,820
Transferred over Time | Identity verification services and other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | $ 6,184 | $ 4,868

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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