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Notes Payable (Details) (USD $)
1 Months Ended 9 Months Ended
Feb. 29, 2012
interest
Sep. 30, 2012
Dec. 31, 2011
Note payable-Debt Agreement      
Carrying value of debt agreement   $ 4,507,000 $ 5,182,000
Previous debt agreement
     
Note payable-Debt Agreement      
Repayment of the previous debt by using proceeds of new debt 408,000    
Structured debt agreement
     
Note payable-Debt Agreement      
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    
Fixed interest rate (as a percent)   25.00%  
Period of amortization in equal principal payments   18 months  
Threshold amount of reserve account, if in excess, entity would receive a specified percentage of excess cash flows up to a maximum dollar amount   1,500,000  
Percentage of excess cash flows exceeding specified balance of reserve account to be received   70.00%  
Maximum monthly amount of excess cash flows from residual interests that will be received if the reserve threshold is met   300,000  
Excess cash flows from residual interests collateralizing note payable   1,500,000  
Carrying value of debt agreement   $ 4,500,000 $ 5,182,000