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Preferred Stock and Stockholders' Equity (Details) (USD $)
0 Months Ended 12 Months Ended
Apr. 07, 2014
Dec. 31, 2007
item
Dec. 31, 2014
Dec. 31, 2013
Preferred Stock and Stockholders’ Equity        
Preferred stock, shares authorized     10,000,000us-gaap_TemporaryEquitySharesAuthorized 10,000,000us-gaap_TemporaryEquitySharesAuthorized
Preferred stock, shares issued     1,610,000us-gaap_TemporaryEquitySharesIssued 1,610,000us-gaap_TemporaryEquitySharesIssued
Private Placement        
Preferred Stock and Stockholders’ Equity        
Common stock for gross proceeds $ 4,825,000us-gaap_ProceedsFromIssuanceOfPrivatePlacement
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
     
Proceeds from issuance, net of fees 4,158,000escr_ProceedsFromIssuanceOfPrivatePlacementNetOfFee
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
     
Issuance of common stock (in shares) 2,018,826us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
     
Share Price $ 2.39us-gaap_SharePrice
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
     
Affiliated Entity | Private Placement        
Preferred Stock and Stockholders’ Equity        
Common stock for gross proceeds 775,000us-gaap_ProceedsFromIssuanceOfPrivatePlacement
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
     
Number of related parties 3escr_NumberOfRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
     
Affiliated Entity | Private Placement | Chief Executive Officer        
Preferred Stock and Stockholders’ Equity        
Common stock for gross proceeds 350,000us-gaap_ProceedsFromIssuanceOfPrivatePlacement
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
     
Reimbursed amount of offering and business development costs $ 120,000escr_ReimbursementOfOfferingAndBusinessDevelopmentCosts
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
     
Series A Cumulative Preferred Stock        
Preferred Stock and Stockholders’ Equity        
Preferred stock, shares authorized   10,000,000us-gaap_TemporaryEquitySharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= escr_SeriesACumulativePreferredStockMember
   
Preferred stock, shares issued   1,610,000us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= escr_SeriesACumulativePreferredStockMember
   
Percentage of Series A Cumulative Preferred Stock   9.25%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= escr_SeriesACumulativePreferredStockMember
   
Price of Series A Preferred Stock   $ 25.00us-gaap_TemporaryEquityRedemptionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= escr_SeriesACumulativePreferredStockMember
   
Preferred Stock, dividend rate   $ 2.3125us-gaap_PreferredStockDividendRatePerDollarAmount
/ us-gaap_StatementClassOfStockAxis
= escr_SeriesACumulativePreferredStockMember
   
Redemption period   90 days    
Number of quarters used to determine whether dividend penalty rate is used   6escr_NumberOfQuartersUsedToDetermineUseOfPenaltyDividendRate
/ us-gaap_StatementClassOfStockAxis
= escr_SeriesACumulativePreferredStockMember
   
Preferred stock dividend penalty rate   12escr_PreferredStockDividendPenaltyRatePercentage
/ us-gaap_StatementClassOfStockAxis
= escr_SeriesACumulativePreferredStockMember