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Summary of Significant Accounting Policies - Summary of Property and Equipment (Details) - USD ($)
$ in Thousands
Apr. 30, 2017
Apr. 30, 2016
Accounting Policies [Abstract]    
Furniture and fixtures $ 74 $ 73
Computer equipment and software 872 715
Laboratory equipment 918 782
Assets in progress 472 0
Leasehold improvements 2 2
Total property and equipment 2,338 1,572
Less: Accumulated depreciation and amortization (1,122) (954)
Property and equipment, net $ 1,216 $ 618