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Commitments and Contingencies (Details Textual) - USD ($)
 6 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Corporate Headquarters [Member]    
Commitments and Contingencies [Line Items]    
Lease Expiration Date Nov. 30, 2016  
Operating Leases, Rent Expense $ 43,000 $ 42,000
Laboratories and Office Space [Member]    
Commitments and Contingencies [Line Items]    
Lease Expiration Date Jun. 30, 2016  
Operating Leases, Rent Expense $ 43,000 43,000
Singapore Office Headquarters in Singapore [Member]    
Commitments and Contingencies [Line Items]    
Lease Expiration Date Jan. 31, 2015  
Operating Leases, Rent Expense $ 0 3,000
New York Laboratory [Member]    
Commitments and Contingencies [Line Items]    
Lease Expiration Date Sep. 30, 2016  
Operating Leases, Rent Expense $ 24,000 $ 23,000