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Stockholders' Deficit (Details 2) - 2010 Plan - shares
1 Months Ended 12 Months Ended
May. 31, 2014
May. 31, 2013
May. 31, 2012
Dec. 31, 2015
Stock Compensation Plans        
Maximum shares authorized for issuance 24,753,475 21,753,475 16,553,475  
Shares authorized for issuance before increase 21,753,475 16,553,475 12,553,475  
Stock Options | Employees Consultants and Scientific Advisers        
Stock Compensation Plans        
Vesting period       3 years
Expiration period       7 years
Stock Options | Non-employee Director        
Stock Compensation Plans        
Expiration period       10 years