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Credit Facility (Details) - USD ($)
1 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2015
Dec. 31, 2014
Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Debt instrument term 3 years    
Maximum borrowing capacity $ 35,000,000    
Amount outstanding   $ 0 $ 0
Debt issuance costs $ 1,000,000    
Unamortized debt issuance costs   $ 300,000  
Quarterly facility fees   0.45%  
Revolving Credit Facility | Alternate Base Rate | Minimum      
Line of Credit Facility [Line Items]      
Variable interest rate 1.75%    
Revolving Credit Facility | Alternate Base Rate | Maximum      
Line of Credit Facility [Line Items]      
Variable interest rate 2.50%    
Revolving Credit Facility | LIBOR | Minimum      
Line of Credit Facility [Line Items]      
Variable interest rate 2.75%    
Revolving Credit Facility | LIBOR | Maximum      
Line of Credit Facility [Line Items]      
Variable interest rate 3.50%    
Revolving Credit Facility | Federal Funds Rate      
Line of Credit Facility [Line Items]      
Variable interest rate 0.50%    
Revolving Credit Facility | Eurodollar      
Line of Credit Facility [Line Items]      
Variable interest rate 1.00%    
Letter of Credit      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity $ 10,000,000