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INCOME TAXES - Valuation allowance (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
INCOME TAXES
valuation allowance for deferred tax asset	$ 3,880,433	$ 2,735,881	$ 1,413,050
January 1,	2,735,881	1,413,050	1,162,612
Net change in the valuation allowance	1,144,552	1,322,831	250,438
- Change in valuation allowance	1,224,430	2,645,495	498,864
- Translation adjustments	(79,878)	(1,322,664)	(248,426)
December 31,	$ 3,880,433	$ 2,735,881	$ 1,413,050

X

- Definition

Amount of change in the valuation allowance for a specified deferred tax asset.

+ References

No definition available.

+ Details

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Namespace Prefix:	mrt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of translation adjustments in the valuation allowance for a specified deferred tax asset.

+ References

No definition available.

+ Details

Name:	mrt_ValuationAllowanceTranslationAdjustments
Namespace Prefix:	mrt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-2

+ Details

Name:	us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration