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Research and License Agreements - Additional Information (Detail)
1 Months Ended 3 Months Ended 18 Months Ended
Jun. 30, 2015
USD ($)
May 31, 2014
USD ($)
Oct. 31, 2011
USD ($)
item
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2013
USD ($)
Research and License Agreements            
Research and Development Expense       $ 5,878,508 $ 5,518,722  
License Agreement | Pfizer            
Research and License Agreements            
Milestone revenue       $ 0 0  
License Agreement | Pfizer | Up-Front Payment Arrangement            
Research and License Agreements            
Upfront payment received     $ 22,500,000      
Upfront payment revenue recognized           $ 22,500,000
Recognition period of up-front payment           1 year 6 months
Research Services Agreement | University Of Basel            
Research and License Agreements            
Royalty payment due against license fees received (as a percent)       10.00%    
Milestone payment obligation       $ 0 $ 0  
Achievement Of Specified Development Milestone | License Agreement | Pfizer            
Research and License Agreements            
Milestone revenue $ 20,000,000 $ 15,000,000        
Achievement Of Specified Development Milestone | License Agreement | Pfizer | Maximum            
Research and License Agreements            
Potential milestone payments     $ 115,000,000      
Number of indications | item     2      
Achievement Of Specified Regulatory Milestone | License Agreement | Pfizer | Maximum            
Research and License Agreements            
Potential milestone payments     $ 70,000,000      
Number of indications | item     2      
Achievement Of Specified Levels Of Annual Net Sales Of Licensed Products | License Agreement | Pfizer | Maximum            
Research and License Agreements            
Potential milestone payments     $ 135,000,000