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Prepaids and Other Current Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Prepaid launch costs, current | $ 1,523 | $ 3,000
Prepaid research and development | 2,377 | 2,841
Prepaid insurance and other assets | 2,871 | 4,332
Prepaids and other current assets | 6,771 | 10,173
Non-current portion of prepaid launch costs | $ 4,800 | $ 4,400

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- Definition Prepaid Insurance And Other Assets, Current + References No definition available. + Details
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- Definition Prepaid Launch Costs, Current + References No definition available. + Details
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- Definition Prepaid Launch Costs, Noncurrent + References No definition available. + Details
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- Definition Prepaid Research And Development Expense, Current + References No definition available. + Details
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Namespace Prefix: | mnts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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- Definition Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(9)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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