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Summary of Significant Accounting Policies - Summary of Property and Equipment (Details) - USD ($)
$ in Thousands
Apr. 30, 2018
Apr. 30, 2017
Accounting Policies [Abstract]    
Furniture and fixtures $ 73 $ 74
Computer equipment and software 973 872
Laboratory equipment 2,490 918
Assets in progress 15 472
Leasehold improvements 0 2
Total property and equipment 3,551 2,338
Less: Accumulated depreciation and amortization (1,468) (1,122)
Property and equipment, net $ 2,083 $ 1,216