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

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- 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

Name:	mrt_AccruedCustomsTaxProvisionCurrent
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