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ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES -Additional information (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES |  |  |
Customs tax provision | $ 78,232 | $ 394,029 | $ 0

X
- Definition Carrying value as of the balance sheet date of obligations incurred and payable for customs tax provision. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References No definition available. + Details
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Namespace Prefix: | mrt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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