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Related Party Balances and Transactions (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Related Party Balances and Transactions (Details) [Line Items] |  |  |  |  |  |
Loans from related parties, accumulative amount | $ 18,063 | $ 7,607 | $ 8,426 |  |  |
Outstanding balance due from related party | $ 128 |  | $ 128 |  |  |
Ochemate [Member] |  |  |  |  |  |
Related Party Balances and Transactions (Details) [Line Items] |  |  |  |  |  |
Loans from related parties, accumulative amount |  |  |  |  | 18,889 | 15,142
Ochem [Member] |  |  |  |  |  |
Related Party Balances and Transactions (Details) [Line Items] |  |  |  |  |  |
Loans from related parties, accumulative amount |  |  |  |  | $ 18,889 | $ 15,142

X
- Definition Accumulated amount of interest-free loans from related parties. + References No definition available. + Details
Name: | mvst_LoansFromRelatedParties
Namespace Prefix: | mvst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. + References No definition available. + Details
Name: | mvst_OutstandingBalanceDueFromRelatedParty
Namespace Prefix: | mvst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | mvst_RelatedPartyBalancesandTransactionsDetailsLineItems
Namespace Prefix: | mvst_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=mvst_OchemateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=mvst_OchemMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |