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Credit Facilities (Details) (USD $)
0 Months Ended
May 19, 2014
Mar. 31, 2015
Dec. 31, 2014
May 19, 2014
Debt Disclosure [Abstract]        
Line of credit facility, current borrowing capacity       $ 5,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Spread over LIBOR 1.85%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1      
Unused commitment fees 0.25%us-gaap_LineOfCreditFacilityCommitmentFeePercentage      
Outstanding borrowing under line of credit   0us-gaap_LineOfCredit 0us-gaap_LineOfCredit  
Outstanding letters of credit   $ 1,000,000us-gaap_LettersOfCreditOutstandingAmount $ 1,000,000us-gaap_LettersOfCreditOutstandingAmount  
Interest rate description 1-month LIBOR Daily Floating Rate plus 1.85%