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Notes Payable (Details) (USD $)
1 Months Ended 12 Months Ended
Feb. 29, 2012
item
Dec. 31, 2012
Apr. 30, 2013
Previous debt agreement
     
Note payable      
Repayment of the previous debt by using proceeds of new debt   $ 408,000  
Structured debt agreement
     
Note payable      
Debt issued 7,500,000    
Number of residual interests used as collateral for structured debt facility 8    
Proceeds from issuance of debt, net of payoff and transaction costs   7,000,000  
Transaction costs incurred   50,000  
Amount of reserve for payment of notes payable     $ 1,500,000