Summary of Significant Accounting Policies (Details)	6 Months Ended
Jun. 30, 2026 Segments
Summary of Significant Accounting Policies [Abstract]
Number of operating segments	1
Number of reportable segments	1
CODM description	The key measure of performance used by the Chief Operating Decision Maker (“CODM”), Marti CEO Oğuz Alper Öktem for the single reportable segment is loss before income tax expense. The CODM uses this metric to assess whether the Group is meeting its cost targets, to identify areas requiring cost discipline, and to determine actions needed to reduce losses and maintain operational efficiency.

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 49
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-49

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-18

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