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Summary of Significant Accounting Policies - Schedule of Fair Value of Warrant Liabilities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Fair value of warrant liabilities beginning balance	$ 39,083	$ 1,794,396
Fair value of warrant, Exercised		(55,791)
Change in fair value of warrants	(26,234)	(1,699,522)
Fair value of warrant liabilities ending balance	$ 12,849	$ 39,083

X

- Definition

Fair value of warrant exercised.

+ References

No definition available.

+ Details

Name:	MARA_FairValueOfWarrantExercised
Namespace Prefix:	MARA_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Warrant liability.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of expense (income) related to adjustment to fair value of warrant liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section 25
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=109262497&loc=d3e20148-110875

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration