Annual report pursuant to section 13 and 15(d)

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended
Oct. 31, 2012
May 31, 2013
May 31, 2012
Commitment And Contingencies [Line Items]      
Cash severance payment   $ 479,000  
Option immediate vesting   780,000 527,500
Severance liabilities   365,000  
Stock based compensation expense   1,128,000  
Asset purchase, cash paid 3,500,000    
Asset Purchase Agreement Aggregate Consideration Paying Period   10 years  
Progenics Pharmaceuticals, Inc
      
Commitment And Contingencies [Line Items]      
Royalty on every net sales   5.00%  
Initial Payment
      
Commitment And Contingencies [Line Items]      
Asset purchase, cash paid   3,500,000  
Milestone Payments | US Phase III trial
      
Commitment And Contingencies [Line Items]      
Asset purchase, cash paid   1,500,000  
Milestone Payments | US new drug application approval by the FDA
      
Commitment And Contingencies [Line Items]      
Asset purchase, cash paid   5,000,000  
Development Milestone Payments
      
Commitment And Contingencies [Line Items]      
Royalty on every net sales   7.50%  
Asset Purchase Agreement Aggregate Consideration Paying Period   10 years  
Minimum annual license maintenance fees   150,000  
Development Milestone Payments | US Phase III trial
      
Commitment And Contingencies [Line Items]      
Asset purchase, cash paid   1,000,000  
Development Milestone Payments | US new drug application approval by the FDA
      
Commitment And Contingencies [Line Items]      
Asset purchase, cash paid   500,000  
Development Milestone Payments | Scenario 3
      
Commitment And Contingencies [Line Items]      
Asset purchase, cash paid   500,000  
Director
      
Commitment And Contingencies [Line Items]      
Salary   13,890  
Cash severance payment   $ 13,890  
Severance period   33 months  
Reimbursement of health insurance period   9 months  
Director | Stock Option Award Agreement dated Dec 6,2010
      
Commitment And Contingencies [Line Items]      
Stock option award agreement   500,000  
Stock Option granted   $ 1.19  
Director | Stock Option Award Agreement dated September 22,2010
      
Commitment And Contingencies [Line Items]      
Options granted   25,000  
Director | Stock Option Award Agreement dated April 16,2012
      
Commitment And Contingencies [Line Items]      
Stock option award agreement   750,000  
Stock Option granted   $ 2.00  
Option immediate vesting   1,500,000  
Options forfeiture   750,000