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Commitments and Contingencies (Details Textual) (USD $) | 9 Months Ended
--- | ---
Jan. 31, 2014 | Jan. 31, 2013
Corporate Headquarters [Member] |  |
Lease Expiration Date | Nov. 30, 2016 |
Operating Leases, Rent Expense | $ 53,000 | $ 52,000
Laboratories and Office Space [Member] |  |
Lease Expiration Date | Jun. 30, 2014 |
Operating Leases, Rent Expense | 64,000 | 69,000
Israel Office Headquarters [Member] |  |
Lease Expiration Date | Jul. 31, 2013 |
Operating Leases, Rent Expense | 6,000 | 21,000
Singapore Office Headquarters in Singapore [Member] |  |
Lease Expiration Date | Jan. 31, 2015 |
Operating Leases, Rent Expense | $ 4,000 | $ 1,000

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_LeaseExpirationDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration