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Debt, Commitments and Contingencies - Schedule of Pending Lawsuits Against Defendants (Details)	Mar. 31, 2018 Lawsuits
District of Delaware [Member]
Number of lawsuits	5

X

- Definition

Number of pending claims pertaining to a loss contingency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

+ Details

Name:	us-gaap_LossContingencyPendingClaimsNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_StatementGeographicalAxis=MARA_DistrictOfDelawareMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: