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Income Taxes (Details) - Schedule of valuation allowance - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of valuation allowance [Abstract] |  |  |
Balance at beginning of the period | $ 30,857 | $ 19,503 | $ 1,822
Additions | 7,402 | 11,649 | 18,102
Reversal | (972) | (295) | (421)
Balance at end of the period | $ 37,287 | $ 30,857 | $ 19,503

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

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- Definition Valuation allowance additions. + References No definition available. + Details
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Namespace Prefix: | mvst_
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Balance Type: | credit
Period Type: | duration

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- Definition Valuation allowance reversal. + References No definition available. + Details
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Namespace Prefix: | mvst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant