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Property and Equipment (Details) - USD ($)
$ in Thousands
Oct. 31, 2015
Apr. 30, 2015
Furniture and fixtures $ 73 $ 70
Computer equipment and software 707 685
Laboratory equipment 512 493
Leasehold improvements 2 2
Total property and equipment 1,294 1,250
Less: Accumulated depreciation (874) (798)
Property and equipment, net $ 420 $ 452