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Noncontrolling Interests (Details) $ in Thousands, ¥ in Millions | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2018 | Feb. 28, 2018 | Mar. 31, 2017 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 23, 2021 shares | Dec. 31, 2020 CNY (¥) shares
Noncontrolling Interests (Details) [Line Items] |  |  |  |  |  |  |  |  |
Percentage of equity interest |  |  | 17.39% |  |  |  |  |  |
Cash consideration received |  |  | $ 400,000 |  |  |  |  |  |
Redemption of noncontroling equity interest percentage |  | 14.05% |  |  |  |  |  |  |
Simple annual interest percentage |  | 6.00% |  |  |  |  |  |  |
Group paid capital |  |  |  | $ 30,000 | $ 30,000 |  | $ 211,566 |  | ¥ 214.2
Exiting noncontrolling interests at redemption value |  |  |  |  |  | $ 114,870 |  |  |
Compounded interest rate |  |  |  |  | 10.00% |  |  |  |
Interest rate paid in cash each year |  |  |  |  | 5.00% |  |  |  |
Financing total amount |  |  |  |  | $ 200,000 |  |  |  |
Minimum repayment |  |  |  |  | $ 30,000 |  |  |  | ¥ 214.2
Repayment percentage |  |  |  |  | 15.00% |  |  |  |
Estimated proceeds from financing |  |  |  |  | $ 400,000 |  |  |  |
Simple interest rate |  |  |  |  | 6.00% |  |  |  |
Ordinary shares converted from warrants (in Shares) | shares |  |  |  |  | 10,631,671 |  |  |  |
Noncontrolling shareholders |  |  |  |  |  |  | 1,016 |  |
Accrual for the performance guarantee compensation |  |  |  |  | $ 1,168 |  |  |  |
Net loss attributable to noncontrolling interests |  |  |  |  |  | 2,123 | 4,783 |  |
Simple annual interest |  | 6.00% |  |  |  |  |  |  |
Convertible of common shares (in Shares) | shares |  |  |  |  |  |  |  | 17,253,182 |
Maximum [Member] |  |  |  |  |  |  |  |  |
Noncontrolling Interests (Details) [Line Items] |  |  |  |  |  |  |  |  |
Shares issued (in Shares) | shares |  |  |  |  | 17,253,182 |  |  |  | 17,253,182
Investors [Member] |  |  |  |  |  |  |  |  |
Noncontrolling Interests (Details) [Line Items] |  |  |  |  |  |  |  |  |
Pursuant to remaining amount |  |  |  | $ 99,038 |  |  |  |  |
Exiting Interest Capital [Member] |  |  |  |  |  |  |  |  |
Noncontrolling Interests (Details) [Line Items] |  |  |  |  |  |  |  |  |
Group paid capital |  |  |  |  |  | 28,986 |  |  |
Payable to exiting investors |  |  |  |  |  |  | 200,000 |  |
Exiting Investors Interest [Member] |  |  |  |  |  |  |  |  |
Noncontrolling Interests (Details) [Line Items] |  |  |  |  |  |  |  |  |
Group paid capital |  |  |  |  |  | 3,714 |  |  |
Payable to exiting investors |  |  |  |  |  |  | $ 11,566 |  |
Exiting Investors [Member] |  |  |  |  |  |  |  |  |
Noncontrolling Interests (Details) [Line Items] |  |  |  |  |  |  |  |  |
Group paid capital |  |  |  |  |  | 32,700 |  |  |
Payable to exiting investors |  |  |  |  | $ 30,000 |  |  |  | ¥ 214.2
Financing total amount |  |  |  |  | 200,000 |  |  |  |
Investors [Member] |  |  |  |  |  |  |  |  |
Noncontrolling Interests (Details) [Line Items] |  |  |  |  |  |  |  |  |
Group paid capital |  |  |  |  | $ 30,000 |  |  |  | ¥ 214.2
Investor [Member] |  |  |  |  |  |  |  |  |
Noncontrolling Interests (Details) [Line Items] |  |  |  |  |  |  |  |  |
Repayment percentage |  |  |  |  | 20.00% |  |  |  |
MVST SPV [Member] |  |  |  |  |  |  |  |  |
Noncontrolling Interests (Details) [Line Items] |  |  |  |  |  |  |  |  |
Shares issued (in Shares) | shares |  |  |  |  | 17,253,182 |  |  |  | 17,253,182
Hongwei’s [Member] |  |  |  |  |  |  |  |  |
Noncontrolling Interests (Details) [Line Items] |  |  |  |  |  |  |  |  |
Settled an outstanding loan |  |  |  |  |  | 14,544 |  |  |
Non-controlling interest transferred to additional paid in capital |  |  |  |  |  | $ 7,771 |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |
Noncontrolling Interests (Details) [Line Items] |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  | 6.00% |  |  |  |
Financing total amount |  |  |  |  | $ 200,000 |  |  |  |
Annual interest rate | 6.00% |  |  |  |  |  |  |  |
Shares issued (in Shares) | shares |  |  |  |  | 10,631,671 |  |  |  | 10,631,671
Maximum [Member] |  |  |  |  |  |  |  |  |
Noncontrolling Interests (Details) [Line Items] |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  | 10.00% |  |  |  |
Financing total amount |  |  |  |  | $ 400,000 |  |  |  |
Annual interest rate | 12.00% |  |  |  |  |  |  |  |

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