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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Apr. 30, 2017
Accounting Policies [Abstract] |
Public Utility Property, Plant, and Equipment | Property and equipment consisted of the following (in thousands):
| April 30,
| 2017 |  | 2016
Furniture and fixtures | $ | 74 |  |  | $ | 73 |
Computer equipment and software | 872 |  |  | 715 |
Laboratory equipment | 918 |  |  | 782 |
Assets in progress | 472 |  |  | — |
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 |
Schedule of Future Minimum Lease Payments for Capital Leases | The following is a schedule by years of future minimum lease payments under this capital lease together with the present value of the net minimum lease payments as of April 30, 2017 (table in thousands):
For the Years Ended April 30, | 2018 |  | $ | 25 |
| 2019 |  | 27 |
| 2020 |  | 16 |
Total minimum lease payments |  |  | 68 |
Less: amount representing interest |  |  | (5 | )
Present value of minimum payments |  |  | 63 |
Less: current portion |  |  | (25 | )
|  |  | $ | 38 |
Schedule of Earnings Per Share, Basic and Diluted |
| Year Ended April 30,
| 2017 |  | 2016
Basic and diluted net loss per share computation |  |  |  |  |
Net loss attributable to common stockholders | $ | (6,883,882 | ) |  | $ | (10,445,537 | )
Weighted Average common shares | 10,684,395 |  |  | 8,695,199 |
Basic and diluted net loss per share | $ | (0.64 | ) |  | $ | (1.20 | )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | The following table reflects the total potential stock-based instruments outstanding at April 30, 2017 and 2016 that could have an effect on the future computation of dilution per common share:
| Year Ended April 30
| 2017 |  | 2016
Stock options | 2,308,704 |  |  | 2,212,757 |
Warrants | 2,004,284 |  |  | 2,109,840 |
Total common stock equivalents | 4,312,988 |  |  | 4,322,597 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of future minimum lease payments as of the date of the latest balance sheet presented, in aggregate and for each of the five years succeeding fiscal years, with separate deductions from the total for the amount representing executor costs, including any profit thereon, included in the minimum lease payments and for the amount of the imputed interest necessary to reduce the net minimum lease payments to present value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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- Definition Tabular disclosure of public utility physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, deprecation expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84167750&loc=d3e42232-110370 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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