Quarterly report pursuant to sections 13 or 15(d)

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2012
Feb. 28, 2013
Feb. 28, 2013
Patent
Commitment And Contingencies [Line Items]      
Option immediate vesting     755,000
Severance liabilities   $ 413,000 $ 413,000
Stock based compensation expense     1,128,000
Asset purchase, cash paid 3,500,000    
Royalty on every net sales   11.50% 11.50%
Asset Purchase Agreement Aggregate Consideration Paying Period     10 years
Minimum annual license maintenance fees   150,000 150,000
Number of Sub-licenses     2
Payment related to the minimum annual license fee   150,000  
Progenics Pharmaceuticals, Inc
      
Commitment And Contingencies [Line Items]      
Royalty on every net sales   5.00% 5.00%
Sub-licensor to Progenics
      
Commitment And Contingencies [Line Items]      
Royalty on every net sales   3.50% 3.50%
Sub-licensor to Progenics
      
Commitment And Contingencies [Line Items]      
Royalty on every net sales   3.00% 3.00%
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     2,500,000
Milestone Payments | US new drug application approval by the FDA
      
Commitment And Contingencies [Line Items]      
Asset purchase, cash paid     500,000
Milestone Payments | Scenario 3
      
Commitment And Contingencies [Line Items]      
Asset purchase, cash paid     5,500,000
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   500,000 500,000
Stock Option granted   $ 1.19 $ 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   750,000 750,000
Stock Option granted   $ 2.00 $ 2.00
Option immediate vesting     1,500,000
Options forfeiture     750,000