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Line of Credit (Details) - SVB - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Jun. 24, 2014
Jun. 30, 2008
Mar. 29, 2006
2006 Credit Line          
Line of Credit          
Maximum borrowing capacity         $ 1,000,000
2008 Credit Line          
Line of Credit          
Maximum borrowing capacity       $ 2,500,000  
Current Line of Credit          
Line of Credit          
Maximum borrowing capacity $ 625,000   $ 625,000    
Borrowing Base $ 380,000        
Period of annual rate for calculating daily rate of finance charge on each advance 360 days        
Finance charge basis prime rate        
Percentage points added in daily rate of finance charge 2.00%        
Minimum interest rate (as a percent) 7.00%        
Monthly collateral handling fee (as a percent) 0.50%        
Borrowings outstanding $ 0 $ 0      
Current Line of Credit | Maximum          
Line of Credit          
Contingent advances as a percentage of each Eligible Account 80.00%