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Share Based Payments Summary of Nonvested Options and Changes (Detail) (USD $)
 9 Months Ended
Nov. 30, 2014
Options  
Nonvested, beginning of period 3,325,481emms_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsOutstandingNumber
Granted 571,219us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Vested 616,282emms_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedNumberOfShares
Forfeited 25,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Nonvested, end of period 3,255,418emms_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsOutstandingNumber
Weighted Average Grant Date Fair Value  
Nonvested, beginning of period $ 0.98emms_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsWeightedAverageGrantDateFairValue
Granted $ 1.64emms_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsGrantedInPeriodWeightedAverageGrantDateFairValue
Vested $ 0.98emms_ShareBasedCompensationShareBasedPaymentAwardsOptionVestedInPeriodWeightedAverageGrantDateFairValue
Forfeited $ 0.57emms_ShareBasedCompensationShareBasedPaymentAwardsOptionForfeitedInPeriodWeightedAverageGrantDateFairValue
Nonvested, end of period $ 1.10emms_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsWeightedAverageGrantDateFairValue