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Stock-based Compensation (Details) - shares
1 Months Ended 6 Months Ended 85 Months Ended 126 Months Ended
May. 31, 2014
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2015
Employee Stock Award Plan-2008 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of option awards vest and exercisable in installments   20.00%    
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward]        
Beginning balance   1,646,947 1,900,000  
Additional shares authorized 1,500,000 0 1,500,000  
Number of awards granted   (363,774) (2,360,283)  
Number of awards forfeited or expired   107,150 350,606  
Ending balance   1,390,323 1,390,323 1,390,323
Employee Stock Award Plan-2008 [Member] | Options Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period   10 years    
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward]        
Number of option awards exercised   54,505 522,068  
Employee Stock Award Plan-2008 [Member] | Unrestricted Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward]        
Number of awards granted   (920) (6,200)  
Employee Stock Award Plan-2008 [Member] | Restricted Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   5 years    
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward]        
Number of restricted stock awards vested   0 18,576  
Director Plan - 2005 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward]        
Beginning balance   87,194   300,000
Number of awards granted   (17,256)   (236,065)
Number of awards forfeited or expired   0   6,003
Ending balance   69,938 69,938 69,938
Director Plan - 2005 [Member] | Options Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward]        
Number of option awards exercised   5,723   10,398
Number of restricted stock awards vested   6,434   17,876