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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Income Taxes [Line Items] |  |  |  |  |
United States statutory tax rate | 35.00% | 21.00% | 24.50% | 35.00% | 35.00%
Decrease in deferred tax asset due to Tax Act |  | $ 8,100 |  |  |
Cash and cash equivalents held by foreign subsidiaries |  | 7,300 | $ 7,300 |  |
Temporary difference related to undistributed earnings |  | 12,900 | 12,900 | $ 12,800 |
Valuation allowance against net deferred tax assets |  |  | (4,237) | 20,087 | $ 7,715
United States |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating loss, carryforwards |  | 62,200 | 62,200 | $ 49,400 |
Net operating loss, carryforwards expiration year |  |  |  | 2028 |
Tax Cuts And Jobs Act Of 2017, change in tax rate income tax expense benefit |  |  | 12,800 |  |
Valuation allowance against net deferred tax assets |  |  | 20,900 | $ 23,600 |
Canada |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating loss, carryforwards |  | 14,000 | $ 14,000 |  |
Net operating loss, carryforwards expiration year |  |  | 2033 |  |
Valuation allowance against net deferred tax assets |  |  | $ 4,400 | $ 4,700 |
Russia |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating loss, carryforwards |  | $ 600 | $ 600 |  |
Net operating loss, carryforwards expiration year |  |  | 2026 |  |

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