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Mainland China Contribution Plan | 9 Months Ended | 12 Months Ended
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Sep. 30, 2021 | Dec. 31, 2020
Retirement Benefits [Abstract] |  |
MAINLAND CHINA CONTRIBUTION PLAN | 18. MAINLAND CHINA CONTRIBUTION PLAN Full time employees of the Group in the PRC participate in a government-mandated multiemployer defined contribution plan pursuant to which certain pension benefits, medical care, unemployment insurance, employee housing fund and other welfare benefits are provided to employees. Chinese labor regulations require the Group to accrue for these benefits based on certain percentages of the employees’ salaries. The total provisions for such employee benefits were $618 and $708 for three months ended September 30, 2020 and 2021, respectively. The total provisions for such employee benefits were $1,572 and $1,989 for nine months ended September 30, 2020 and 2021, respectively. | 19. MAINLAND CHINA CONTRIBUTION PLAN Full time employees of the Group in the PRC participate in a government-mandated multiemployer defined contribution plan pursuant to which certain pension benefits, medical care, unemployment insurance, employee housing fund and other welfare benefits are provided to employees. Chinese labor regulations require the Group to accrue for these benefits based on certain percentages of the employees’ salaries. The total provisions for such employee benefits were $4,262, $2,722 and $2,192 for the years ended December 31, 2018, 2019 and 2020, respectively.

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- Definition The entire disclosure for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -URI http://asc.fasb.org/subtopic&trid=2235116 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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