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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2019 | Apr. 30, 2018 | May 01, 2019 | Jul. 31, 2018 | Oct. 30, 2017 | Apr. 30, 2017 | Nov. 30, 2014
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Restricted cash | $ 0 | $ 150,000 |  |  |  |  |
Net income (loss) | 128,000 | (1,476,000) |  |  |  |  |
Accumulated deficit | 70,698,000 | 70,826,000 |  |  |  |  |
Working capital | (103,000) |  |  |  |  |  |
Cash, cash equivalents, restricted cash and restricted cash equivalents | 3,237,000 | 1,006,000 |  |  |  | $ 3,445,000 |
Maximum borrowing capacity |  |  |  |  | $ 1,500,000.0 |  |
Unrecognized tax benefits | $ 151,000 | $ 151,000 |  |  |  | $ 121,000 |
Operating lease, liability |  |  | $ 4,100,000 |  |  |  |
Operating lease, right-of-use asset |  |  | $ 3,200,000 |  |  |  |
Minimum |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Useful life | 3 years |  |  |  |  |  |
Maximum |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Useful life | 7 years |  |  |  |  |  |
November 2014 - Laboratory Equipment Lease |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Capital leases, future minimum payments, executory costs |  |  |  |  |  |  | $ 149,000
Capital leases monthly payments |  |  |  |  |  |  | $ 3,000
Capital leases, future minimum payments, present value of net minimum payments | $ 16,000 |  |  |  |  |  |
Capital leases of lessee, contingent rentals, basis spread on variable rate | 5.00% |  |  |  |  |  |
July 2018 - Laboratory Equipment Lease |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Capital leases, future minimum payments, executory costs |  |  |  | $ 266,000 |  |  |
Capital leases monthly payments |  |  |  | $ 11,000 |  |  |
Capital leases, future minimum payments, present value of net minimum payments | $ 0 |  |  |  |  |  |

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