Annual report pursuant to Section 13 and 15(d)

STOCKHOLDERS' EQUITY (Details)

v2.4.1.9
STOCKHOLDERS' EQUITY (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Number Warrants  
Cancelled 46,154us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpirations
Exercised 214,846us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised
Warrants 1,926,308us-gaap_ClassOfWarrantOrRightOutstanding
Warrants  
Number Warrants  
Warrants 1,926,308us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
Granted 770,788us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
Cancelled 46,154us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpirations
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
Forfeited   
Exercised 214,846us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
Warrants 1,926,308us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
Awards Exercisable 1,926,308us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
Weighted Average Exercise Price  
Weighted average exercise price, beginning balance 3.33MARA_WeightedAverageExercisePriceBeginningBalanceStockWarrant
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
Granted 5.26MARA_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
Cancelled   
Forfeited   
Exercised 3.27MARA_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
Warrant Exercise Price 4.10MARA_ExercisePriceOfWarrantsOrRightsClassOfWarrantOrRight
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
Weighted Average Remaining Contractual Life  
Weighted average contractual life, beginning balance 2 years 8 months 26 days
Weighted average contractual life, ending balance 1 year 6 months 18 days
Grant date fair value (per share) 1.28us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember