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Share-Based Compensation (Stock Options) (Details) - shares
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Apr. 30, 2015
ESPP            
Stock Options            
Common stock reserved for issuance (in shares) 150,000          
Granted       0    
A & R 2015 Plan            
Stock Options            
Common stock reserved for issuance (in shares) 2,400,000          
Granted       0    
2015 Plan | Employees, directors and consultants            
Stock Options            
Common stock reserved for issuance (in shares)           320,615
Granted   0 102,130 0 102,130  
Vested   28,107 37,215 63,492 37,215  
Forfeited   0 0 0 0  
Available for future issuance   15,337   15,337    
Stock options | A & R 2015 Plan | Officers, directors and employees            
Stock Options            
Number of options awarded to be granted (in shares) 1,818,000