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Stock-Based Compensation (Details Narrative) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract]    
Weighted-average grant-date fair value of stock options granted $ 0.93us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue  
Stock-based compensation expense $ 31,000us-gaap_ShareBasedCompensation   
Compensation cost related to stock options not yet recognized 406,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions  
Period of compensation cost related to stock options not yet recognized 1 year 11 months 1 day  
Number of common stock purchase under plan 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  
[1] (2) Granted under 2015 Stock Incentive Plan