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Credit Facility (Details) - USD ($)
$ in Millions
3 Months Ended
Oct. 31, 2008
Jun. 30, 2015
Mar. 31, 2015
Credit facility      
Revolving Line of Credit      
Maximum borrowing capacity $ 19.5    
Amount outstanding   $ 0.0 $ 0.0
Revolving Line of Credit      
Revolving Line of Credit      
Maximum borrowing capacity $ 12.0    
Term of debt instrument   2 years  
Prime rate at the end of the period (as a percent)   3.25%  
Monthly interest rate basis   prime rate  
Unused line fee (as a percent)   0.15%  
Bank Term Note      
Revolving Line of Credit      
Term of debt instrument 48 months    
Principal amount $ 7.5