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Commitments and Contingencies - Additional Information (Detail)

v3.3.1.900
Commitments and Contingencies - Additional Information (Detail) - Project Work Order
 12 Months Ended
May. 31, 2015
USD ($)
Commitment And Contingencies [Line Items]  
Payments for Fees $ 733,916
Estimated remaining cost 3,600,000
Remaining cost of manufacturing agreement 3,200,000
Minimum  
Commitment And Contingencies [Line Items]  
Estimated cost of studies 13,000,000
Maximum  
Commitment And Contingencies [Line Items]  
Estimated cost of studies 15,000,000
Amarex Clinical Research, LLC  
Commitment And Contingencies [Line Items]  
Estimated cost of studies $ 4,400,000