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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2017
Income Taxes [Line Items] |  |  |
United States statutory tax rate | 21.00% | 21.00% |
Cash and cash equivalents held by foreign subsidiaries | $ 2,600 | $ 2,600 |
Temporary difference related to undistributed earnings | 6,900 | 6,500 |
Unrecognized tax liabilities | 0 | 0 |
Valuation allowance against net deferred tax assets | 3,768 | 2,893 |
United States |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss, carryforwards | 106,200 |  | $ 28,000
Net operating loss, carryforwards expiration year |  |  | 2028
Net operating loss, carryforwards after tax act do not expire | 77,900 |  |
Valuation allowance against net deferred tax assets | 35,500 | 31,700 |
Canada |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss, carryforwards | $ 19,800 |  |
Net operating loss, carryforwards expiration year | 2033 |  |
Valuation allowance against net deferred tax assets | $ 5,200 | 5,400 |
Russia |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss, carryforwards | $ 2,300 |  |
Net operating loss, carryforwards expiration year | 2026 |  |
Valuation allowance against net deferred tax assets | $ 700 | $ 300 |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI https://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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