Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY (Details)

v2.4.1.9
STOCKHOLDERS' EQUITY (Details) (Common Stock Warrant [Member], USD $)
3 Months Ended
Mar. 31, 2015
Common Stock Warrant [Member]
 
Number of Warrants  
Warrants, beginning balance 1,926,308us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_StatementEquityComponentsAxis
= MARA_CommonStockWarrantMember
Granted 100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_StatementEquityComponentsAxis
= MARA_CommonStockWarrantMember
Cancelled   
Forfeited   
Exercised 5,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised
/ us-gaap_StatementEquityComponentsAxis
= MARA_CommonStockWarrantMember
Warrants, ending balance 2,021,308us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_StatementEquityComponentsAxis
= MARA_CommonStockWarrantMember
Warrants Exercisable 2,021,308MARA_WarrantsExercisable
/ us-gaap_StatementEquityComponentsAxis
= MARA_CommonStockWarrantMember
Weighted Average Exercise Price  
Weighted average exercise price, beginning balance $ 4.10us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= MARA_CommonStockWarrantMember
Granted $ 7.44us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= MARA_CommonStockWarrantMember
Cancelled   
Forfeited   
Exercised $ 3.75us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= MARA_CommonStockWarrantMember
Weighted average exercise price, ending balance $ 4.27us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= MARA_CommonStockWarrantMember
Weighted average fair value of warrants granted during the period $ 3.19MARA_WeightedAverageFairValueOfWarrantsGrantedDuringPeriod
/ us-gaap_StatementEquityComponentsAxis
= MARA_CommonStockWarrantMember
Weighted Average Remaining Life  
Weighted average remaining life, beginning balance 1 year 6 months 18 days
Granted 4 years 10 months 2 days
Exercised 1 year 1 month 2 days
Weighted average remaining life, beginning balance 1 year 5 months 23 days