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Marketable Securities (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Aggregate Fair Value $ 10,900,722us-gaap_InvestmentsFairValueDisclosure $ 8,073,108us-gaap_InvestmentsFairValueDisclosure
Cost or Amortized Cost 10,902,130us-gaap_AvailableForSaleSecuritiesAmortizedCost 8,069,698us-gaap_AvailableForSaleSecuritiesAmortizedCost
Net Unrealized Gains (Losses) (1,408)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss 3,410us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss
Government securities    
Schedule of Available-for-sale Securities [Line Items]    
Aggregate Fair Value 6,740,825us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
6,252,339us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Cost or Amortized Cost 6,741,466us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
6,249,483us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Net Unrealized Gains (Losses) (641)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
2,856us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Corporate debt securities    
Schedule of Available-for-sale Securities [Line Items]    
Aggregate Fair Value 4,159,897us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
1,820,769us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Cost or Amortized Cost 4,160,664us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
1,820,215us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Net Unrealized Gains (Losses) $ (767)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
$ 554us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember