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Summary of Significant Accounting Policies - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Warrant liability	$ 12,849	$ 39,083	$ 1,794,396
Level 1 [Member]
Warrant liability
Level 2 [Member]
Warrant liability
Level 3 [Member]
Warrant liability	$ 12,849	$ 39,083

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- Definition

Warrant liability.

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No definition available.

+ Details

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Namespace Prefix:	MARA_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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