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Accrued Compensation - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2018 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Accrued social insurance adjustment |  |  | $ 0 | $ 0 | $ 0 | $ 9,464
Guangzhou | Disposed of by Sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Indemnification period |  | 2 years |  |  |  |
Accrued social insurance adjustment | $ 9,500 |  |  |  |  |

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