Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY (Details 1)

v2.4.1.9
STOCKHOLDERS' EQUITY (Details 1) (Common Stock Option [Member], USD $)
3 Months Ended
Mar. 31, 2015
Common Stock Option [Member]
 
Number of Options  
Options outstanding, beginning 3,017,690us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_StatementEquityComponentsAxis
= MARA_CommonStockOptionMember
Granted 65,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_StatementEquityComponentsAxis
= MARA_CommonStockOptionMember
Cancelled   
Forfeited 418,349us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_StatementEquityComponentsAxis
= MARA_CommonStockOptionMember
Exercised   
Options outstanding, ending 2,664,342us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_StatementEquityComponentsAxis
= MARA_CommonStockOptionMember
Options Exercisable 1,239,781MARA_OptionsExercisable
/ us-gaap_StatementEquityComponentsAxis
= MARA_CommonStockOptionMember
Options expected to vest 1,424,560MARA_OptionsExpectedToVest
/ us-gaap_StatementEquityComponentsAxis
= MARA_CommonStockOptionMember
Weighted Average Exercise Price  
Weighted average exercise price, beginning balance $ 4.64us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= MARA_CommonStockOptionMember
Granted $ 6.92us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= MARA_CommonStockOptionMember
Cancelled   
Forfeited $ 5.71us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= MARA_CommonStockOptionMember
Exercised   
Weighted average exercise price, ending balance $ 4.52us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= MARA_CommonStockOptionMember
Weighted average fair value of options granted during the period $ 2.12MARA_WeightedAverageFairValueOfOptionsGrantedDuringPeriod
/ us-gaap_StatementEquityComponentsAxis
= MARA_CommonStockOptionMember
Weighted Average Remaining Life  
Weighted Average Remaining Life, beginning 7 years 9 months 7 days
Granted 4 years 11 months 5 days
Forfeited 9 years 2 months 8 days
Weighted Average Remaining Life, ending 7 years 1 month 28 days