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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Income Taxes [Line Items] |  |  |  |  |
Liability for uncertain tax positions | $ 100 |  | $ 100 |  | $ 300
Deferred income taxes on undistributed earnings |  |  | 13 | $ (595) |
Income tax expense (benefit) | $ 206 | $ 739 | $ 1,549 | $ (2,569) |
Effective income tax rate | (468.20%) | 27.70% | 19.40% | (38.10%) |
Zhongli [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax expense (benefit) |  | $ (4,400) |  | $ (4,400) |
Foreign Subsidiaries [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Deferred income taxes on undistributed earnings |  |  | $ (500) |  | $ (700)

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