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Stockholders' Equity - Stock Based Compensation Expense by Function (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Stockholders' Equity |  |
Stock compensation expense |  | $ 1,801
Technology and operations |  |
Stockholders' Equity |  |
Stock compensation expense | $ 303 | 367
Sales and marketing |  |
Stockholders' Equity |  |
Stock compensation expense | 490 | 580
General and administrative |  |
Stockholders' Equity |  |
Stock compensation expense | 1,487 | 1,282
Total stock compensation expense: |  |
Stockholders' Equity |  |
Stock compensation expense | $ 2,280 | $ 2,229

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