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Credit Facility (Details) - USD ($)
1 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Jun. 30, 2016
Dec. 31, 2015
Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Debt instrument term   3 years    
Maximum borrowing capacity $ 35,000,000 $ 35,000,000    
Quarterly facility fees 0.45%      
Amount outstanding     $ 0 $ 0
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 $ 10,000,000