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Summary of Significant Accounting Policies (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2016 | Apr. 30, 2015
Accounting Policies [Abstract] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |  | 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):
|  | 2015 |  | 2014 |
Balance beginning of year |  | $ | (2,011) |  | $ | (1,046) |
Transfers to (from) Level 3 |  |  | — |  |  | — |
Change in fair value included in earnings |  |  | 981 |  |  | (965) |
Modification Charge |  |  | (586) |  |  |  |
Reclassification to equity |  |  | 1,616 |  |  | — |
Balance end of year |  | $ | — |  | $ | (2,011) |
Public Utility Property, Plant, and Equipment [Table Text Block] |  | Property and equipment consisted of the following (in thousands):
|  | April 30, |
|  | 2015 |  | 2014 |
Furniture and fixtures |  | $ | 70 |  | $ | 69 |
Computer equipment and software |  |  | 685 |  |  | 655 |
Laboratory equipment |  |  | 493 |  |  | 296 |
Leasehold improvements |  |  | 2 |  |  | 2 |
Total property and equipment |  |  | 1,250 |  |  | 1,022 |
Less: Accumulated depreciation and amortization |  |  | (798) |  |  | (588) |
Property and equipment, net |  | $ | 452 |  | $ | 434 |
Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block] | 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 January 31, 2016 (table in thousands):
For the Years Ended April 30, |  | Total |
2016 (remaining) |  | $ | 6 |
2017 |  |  | 24 |
2018 |  |  | 25 |
2019 |  |  | 27 |
2020 |  |  | 16 |
Total minimum payments |  |  | 98 |
Less: amount representing interest |  |  | (10) |
Present value of minimum payments |  |  | 88 |
Less: current portion |  |  | (24) |
|  | $ | 64 |
| 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, 2015:
For the Years Ended April 30, |  | 2016 |  |  | 23 |
|  | 2017 |  |  | 24 |
|  | 2018 |  |  | 25 |
|  | 2019 |  |  | 26 |
|  | 2020 |  |  | 16 |
Total minimum lease payments |  |  |  | $ | 114 |
Less: current maturity |  |  |  |  | (23) |
Long-term maturity |  |  |  |  | 91 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended January 31, |  | Nine Months Ended January 31,
|  | 2016 |  | 2015 |  | 2016 |  | 2015
Basic loss per share computation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to common stockholders |  | $ | (2,412,381 | ) |  | $ | (2,816,465 | ) |  | $ | (7,872,115 | ) |  | $ | (9,462,281 | )
Weighted Average common shares – basic |  |  | 8,702,237 |  |  |  | 5,574,447 |  |  |  | 8,702,237 |  |  |  | 5,574,244 |
Basic net loss per share |  | $ | (0.28 | ) |  | $ | (0.51 | ) |  | $ | (0.90 | ) |  | $ | (1.70 | )
Diluted loss per share computation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to common stockholders |  | $ | (2,412,381 | ) |  | $ | (2,816,465 | ) |  | $ | (7,872,115 | ) |  | $ | (9,462,281 | )
Less: Gain on derivative warrant liability |  |  | — |  |  |  | 620,687 |  |  |  | — |  |  |  | 1,401,314 |
Loss available to common stockholders |  | $ | (2,412,381 | ) |  | $ | (3,437,152 | ) |  | $ | (7,872,115 | ) |  | $ | (10,863,595 | )
Weighted Average common shares |  |  | 8,702,237 |  |  |  | 5,574,447 |  |  |  | 8,702,237 |  |  |  | 5,574,244 |
Incremental shares from assumed exercise of warrants and stock options |  |  | — |  |  |  | 29,351 |  |  |  | — |  |  |  | 29,351 |
Adjusted weighted average share – diluted |  |  | 8,702,237 |  |  |  | 5,603,798 |  |  |  | 8,702,237 |  |  |  | 5,603,595 |
Diluted net loss per share |  | $ | (0.28 | ) |  | $ | (0.61 | ) |  | $ | (0.90 | ) |  | $ | (1.94 | )
|  | Year Ended April 30, |
|  | 2015 |  | 2014 |
Basic loss per share computation |  |  |  |  |  |  |
Net loss attributable to common stockholders |  | $ | (13,139,820) |  | $ | (7,406,367) |
Weighted Average common shares – basic |  |  | 5,985,346 |  |  | 5,571,993 |
Basic net loss per share |  | $ | (2.20) |  | $ | (1.33) |
Diluted loss per share computation |  |  |  |  |  |  |
Net loss attributable to common stockholders |  | $ | (13,139,820) |  | $ | (7,406,367) |
Less: Gain on derivative warrant liability |  |  | 980,519 |  |  | — |
Loss available to common stockholders |  | $ | (14,120,339) |  | $ | (7,406,367) |
Weighted Average common shares |  |  | 5,985,346 |  |  | 5,571,993 |
Incremental shares from assumed exercise of warrants and stock options |  |  | 439,065 |  |  | — |
Adjusted weighted average share – diluted |  |  | 6,424,410 |  |  | 5,571,993 |
Diluted net loss per share |  | $ | (2.20) |  | $ | (1.33) |
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, 2016 and 2015 that could have an effect on the future computation of dilution per common share:
|  | January 31,
|  | 2016 |  | 2015
Stock options |  |  | 2,212,571 |  |  |  | 1,999,167 |
Warrants |  |  | 2,109,840 |  |  |  | 260,556 |
Total common stock equivalents |  |  | 4,322,411 |  |  |  | 2,259,723 |
| The following table reflects the total potential share-based instruments outstanding at April 30, 2015 and 2014 that could have an effect on the future computation of dilution per common share:
|  | Year Ended April 30, |
|  | 2015 |  | 2014 |
Stock options |  |  | 2,004,002 |  |  | 1,945,920 |
Warrants |  |  | 2,109,840 |  |  | 273,056 |
Total common stock equivalents |  |  | 4,113,842 |  |  | 2,218,975 |

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