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Summary of Significant Accounting Policies (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2015 | Apr. 30, 2014
Accounting Policies [Abstract] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] | The following table presents information about our warrants liability, which was our only financial instrument measured at fair value on a recurring basis using significant unobservable inputs (Level 3) as of January 31, 2015 and April 30, 2014 (in thousands):
Balance, May 1, 2014 |  | $ | (2,011) |
Transfers to (from) Level 3 |  |  | - |
Total (gains) losses included in earnings |  |  | 1,401 |
Purchases, issuances and settlements, net |  |  | - |
Balance, January 31, 2015 |  | $ | (610) |
| The following table presents information about our warrant liability, which was our only financial instrument measured at fair value on a recurring basis using significant unobservable inputs (Level 3) as of April 30 (dollars in thousands):
|  | 2014 |  | 2013 |
Balance beginning of year |  | $ | (1,046) |  | $ | (555) |
Transfers to (from) Level 3 |  |  | - |  |  | - |
Total gains (losses) included in earnings |  |  | (965) |  |  | (74) |
Issuances |  |  | - |  |  | (417) |
Balance end of year |  | $ | (2,011) |  | $ | (1,046) |
Public Utility Property, Plant, and Equipment [Table Text Block] |  | Property and equipment is recorded at cost and primarily consists of laboratory equipment, furniture and fixtures, and computer hardware and software. Depreciation is calculated on a straight-line basis over the estimated useful lives of the various assets ranging from three to seven years. Property and equipment consisted of the following (in thousands):
|  | April 30, |
|  | 2014 |  | 2013 |
Furniture and fixtures |  | $ | 69 |  | $ | 59 |
Computer equipment and software |  |  | 655 |  |  | 549 |
Laboratory equipment |  |  | 296 |  |  | 179 |
Leasehold improvements |  |  | 2 |  |  | 2 |
Total property and equipment |  |  | 1,022 |  |  | 789 |
Less: Accumulated depreciation |  |  | (588) |  |  | (375) |
Property and equipment, net |  | $ | 434 |  | $ | 414 |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] | The following table reflects the total potential share-based instruments outstanding at January 31, 2015 and 2014 that could have an effect on the future computation of dilution per common share:
|  | January 31, |
|  | 2015 |  |  | 2014 |
Stock options |  |  | 23,990,008 |  |  |  | 22,633,955 |
Warrants |  |  | 3,126,667 |  |  |  | 3,276,667 |
Total common stock equivalents |  |  | 27,116,675 |  |  |  | 25,910,622 |
| The following table reflects the total potential share-based instruments outstanding at April 30, 2014 and 2013, that could have an effect on the future computation of dilution per common share:
|  | Year Ended April 30, |
|  | 2014 |  | 2013 |
Stock options |  |  | 23,351,037 |  |  | 13,890,205 |
Warrants |  |  | 3,276,667 |  |  | 3,276,667 |
Restricted stock |  |  | - |  |  | 50,000 |
Total common stock equivalents |  |  | 26,627,704 |  |  | 17,216,872 |

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258 + Details
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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 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=6499596&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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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