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Common Stock - Narrative (Details) - USD ($) |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Apr. 27, 2017 | Feb. 22, 2017 | Jan. 24, 2017 | Jul. 06, 2016 | Jun. 15, 2016 | Apr. 30, 2017 | Apr. 30, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |
Proceeds from June 2016 Public Offering |  |  |  |  | $ 4,300,000 | $ 4,340,000 | $ 0
Payments of issuance costs |  |  |  |  | $ 742,000 | 0 | 18,000
Issuance of common stock (in shares) | 3,807 | 7,614 | 3,247 | 3,896 |  |  |
Issuance of common stock for services | $ 7,500 | $ 15,000 | $ 11,852 | $ 8,688 |  | $ 44,000 | $ 44,000
Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Issuance of registered shares (in shares) |  |  |  |  | 2,000,000 |  |
Share Price |  |  |  |  | $ 2.25 |  |
Over-Allotment Option | Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Issuance of registered shares (in shares) |  |  |  |  | 258,749 |  |

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