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Mainland China Contribution Plan (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jul. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jul. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Retirement Benefits [Abstract] |  |  |  |  |  |  |
Total employee benefits |  |  | $ 2,192 |  |  | $ 2,722 | $ 4,262
Employee benefits | $ 1,989 | $ 708 |  | $ 1,572 | $ 618 |  |

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- Definition Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6935-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6911-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The value of a trust established to hold the stock of an employee compensation and benefits plan as of the balance sheet date. + References No definition available. + Details
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