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Stock-Based Compensation (Details Narrative) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]      
Weighted-average grant-date fair value of stock options granted $ 0.93us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue   $ 0.12us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue
Stock-based compensation expense $ 31,000us-gaap_ShareBasedCompensation    $ 10,000us-gaap_ShareBasedCompensation
Compensation cost related to stock options not yet recognized 406,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions   110,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
Period of compensation cost related to stock options not yet recognized 1 year 11 months 1 day   1 year 9 months 29 days
Number of common stock purchase under plan 1,000,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans   1,000,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Exercise price description The exercise price per share of each stock option shall not be less than 20 percent of the fair market value of the Company's common stock on the date of grant.    
Aggregate intrinsic value of options outstanding 1,735,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue    
Number of unvested options 350,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares    
Aggregate grant date fair value unvested options 327,000esdi_AggregateGrantDateFairValueUnvestedOptions    
Aggregate intrinsic value of unvested options 85,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested    
Aggregate grant date fair value of options granted $ 327,000esdi_AggregateGrantDateFairValueOfOptionsGranted    
Total number of shares available for grant 3,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant    
Vesting period of option 5 years    
Number of Options Granted 350,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross [1]    
Stock options issued Plan outstanding 350,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized    
Excercise price of common stock per share     $ 0.40us-gaap_SaleOfStockPricePerShare
[1] (2) Granted under 2015 Stock Incentive Plan