Subsequent Events	9 Months Ended	12 Months Ended
Sep. 30, 2021	Dec. 31, 2020
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	22. SUBSEQUENT EVENTS New RSU and PSU Grants On October 27, 2021, the Company granted 265,399 RSUs and 265,399 PSUs to employees, subject to service and market conditions. The service condition requires the participant’s continued employment with the Company through the applicable vesting date, and the market condition requires that the Company’s Common Stock subsequent to the grant date above a specified level for a defined period of time. Acquisition of Building In October 2021, the Group acquired a building in Florida, United States, at the cost of $11.0 million for research and development projects.	25. SUBSEQUENT EVENTS The Group has evaluated events subsequent to the balance sheet date of December 31, 2020 through June 3, 2021, the date on which the financial statements are available to be issued. Issuance of Convertible Promissory Notes On January 4, 2021, the Company entered into a note agreement to issue $57,500 convertible promissory notes to certain investors, fully due and payable on the third anniversary of the initial closing date. The notes bear no interest, provided, however, if a liquidity event has not occurred prior to March 31, 2022, an interest rate of 6% shall be applied retrospectively from the date of initial closing. The conversion of the promissory notes are contingent upon the occurrence of a Private Investment in Public Equity (“PIPE”) financing, a liquidity event or a new financing after March 31, 2022 and before the maturity date. The first tranche and second tranche of the convertible promissory notes were issued in January 2021 and February 2021 at amount of $25,000 and $32,500, respectively. As the Company entered into the SPAC Transaction in February 2021, the principal balance and all accrued and unpaid interest under the notes, if any, will automatically be converted at the closing of the SPAC Transaction into a number of shares of common stock of Holdings. Acquisition of Building In January 2021, the Group acquired a manufacturing facility in Tennessee, United States, at the cost of $18.3 million to build production lines. Merger Transaction On February 1, 2021, Microvast, Holdings, and Merger Sub, entered in to the Merger Agreement for the proposed SPAC Transaction. Pursuant to the Merger Agreement, Merger Sub will merge with and into Microvast, with Microvast surviving the Merger as a wholly-owned subsidiary of Holdings; and upon consummation of the Merger, all of the issued and outstanding capital stock of Microvast as of immediately prior to the Merger will be cancelled in exchange for the right to receive shares of common stock of Holdings such that, following the consummation of the Merger, all of the stockholders of Microvast immediately prior to the Merger will become stockholders of Holdings. Bank Loans In the second quarter of 2021, the Group entered into several short-term loans with certain banks in the PRC. The interest rates of the loans range from 5% to 6%. The proceeds from the bank loans with aggregate amount of $9,921 were received by the Group as of the date of this report.

Subsequent Events

9 Months Ended

12 Months Ended

Sep. 30, 2021

Dec. 31, 2020

22. SUBSEQUENT EVENTS

New RSU and PSU Grants

On October 27, 2021, the Company granted 265,399 RSUs and 265,399 PSUs to employees, subject to service and market conditions. The service condition requires the participant’s continued employment with the Company through the applicable vesting date, and the market condition requires that the Company’s Common Stock subsequent to the grant date above a specified level for a defined period of time.

Acquisition of Building

In October 2021, the Group acquired a building in Florida, United States, at the cost of $11.0 million for research and development projects.

25. SUBSEQUENT EVENTS

The Group has evaluated events subsequent to the balance sheet date of December 31, 2020 through June 3, 2021, the date on which the financial statements are available to be issued.

Issuance of Convertible Promissory Notes

On January 4, 2021, the Company entered into a note agreement to issue $57,500 convertible promissory notes to certain investors, fully due and payable on the third anniversary of the initial closing date. The notes bear no interest, provided, however, if a liquidity event has not occurred prior to March 31, 2022, an interest rate of 6% shall be applied retrospectively from the date of initial closing. The conversion of the promissory notes are contingent upon the occurrence of a Private Investment in Public Equity (“PIPE”) financing, a liquidity event or a new financing after March 31, 2022 and before the maturity date. The first tranche and second tranche of the convertible promissory notes were issued in January 2021 and February 2021 at amount of $25,000 and $32,500, respectively. As the Company entered into the SPAC Transaction in February 2021, the principal balance and all accrued and unpaid interest under the notes, if any, will automatically be converted at the closing of the SPAC Transaction into a number of shares of common stock of Holdings.

Acquisition of Building

In January 2021, the Group acquired a manufacturing facility in Tennessee, United States, at the cost of $18.3 million to build production lines.

Merger Transaction

On February 1, 2021, Microvast, Holdings, and Merger Sub, entered in to the Merger Agreement for the proposed SPAC Transaction. Pursuant to the Merger Agreement, Merger Sub will merge with and into Microvast, with Microvast surviving the Merger as a wholly-owned subsidiary of Holdings; and upon consummation of the Merger, all of the issued and outstanding capital stock of Microvast as of immediately prior to the Merger will be cancelled in exchange for the right to receive shares of common stock of Holdings such that, following the consummation of the Merger, all of the stockholders of Microvast immediately prior to the Merger will become stockholders of Holdings.

Bank Loans

In the second quarter of 2021, the Group entered into several short-term loans with certain banks in the PRC. The interest rates of the loans range from 5% to 6%. The proceeds from the bank loans with aggregate amount of $9,921 were received by the Group as of the date of this report.