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Savant Arrangements (Details) - USD ($)
3 Months Ended 12 Months Ended
Feb. 29, 2016
Jun. 30, 2016
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Research and development expense     $ 1,704,000 $ 5,905,000  
Savant Neglected Diseases, LLC [Member]          
Monthly payment amount $ 87,500   87,500    
Payments for in process research and development 500,000   2,687,500   $ 250,000
Initial payment amount $ 3,000,000   2,500,000    
Legal expenses     $ 100,000    
Number of shares called by warrant 200,000   200,000    
Exercise price of warrant $ 2.25   $ 2.25    
Milestone payments and certain other contingent payments     $ 21,000,000    
Exercise period of warrant 5 years   5 years    
Research and development expense   $ 87,500 $ 750,000    
Savant Neglected Diseases, LLC [Member] | Exercisable upon reaching certain milestones [Member]          
Percentage of warrants exercisable 75.00%   75.00%    
Savant Neglected Diseases, LLC [Member] | Exercisable Immediately [Member]          
Percentage of warrants exercisable 25.00%   25.00%