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Income Taxes - Schedule of Calculation of the Effective Tax Rate (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2020 | Mar. 31, 2019
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Income (loss) before income taxes | $ 9,555 |  | $ 1,363 |  | $ 12,888 | $ (1,571)
Income tax provision | 2,134 |  | 405 |  | 2,692 | 166
Net income (loss) | $ 7,421 | $ 2,775 | $ 958 | $ (2,695) | $ 10,196 | $ (1,737)
Effective tax rate | 22.00% |  | 30.00% |  | 21.00% | (11.00%)

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