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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) | Total | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Accumulated Other Comprehensive Loss [Member]
--- | --- | --- | --- | --- | --- | ---
Balance at Apr. 30, 2014 | $ 3,197,000 | $ 6,000 | $ (1,252,000) | $ 43,323,000 | $ (38,880,000) | $ 0
Balance (in shares) at Apr. 30, 2014 |  | 5,573,821 | 269,685 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock-based compensation | 2,948,000 |  |  | 2,948,000 |  |
Exercise of options and warrants | 2,000 |  |  | 2,000 |  |
Exercise of options and warrants (in shares) |  | 313 |  |  |  |
Conversion of convertible notes and accrued interest | 2,060,000 |  |  | 2,060,000 |  |
Sale and Issuance of common stock | 11,160,000 | $ 3,000 |  | 11,157,000 |  |
Sale and Issuance of common stock, net of issuance costs of $880k (in shares) |  | 2,929,778 |  |  |  |
Issuance of share under anti-dilution provisions | 2,000 |  |  | 2,000 |  |
Issuance of share under anti-dilution provisions (in shares) |  | 188,704 |  |  |  |
Stock Option Modification | 214,000 |  |  | 214,000 |  |
Reclassification of warrant Liability | 1,616,000 |  |  | 1,616,000 |  |
Net loss | (13,139,820) |  |  |  | (13,140,000) |
Balance at Apr. 30, 2015 | 8,059,000 | $ 9,000 | $ (1,252,000) | 61,322,000 | (52,020,000) |
Balance (in shares) at Apr. 30, 2015 |  | 8,692,616 | 269,685 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock-based compensation | 2,599,000 |  |  | 2,599,000 |  |
Payment of issuance costs related to 2015 Private Placement | (18,000) |  |  | (18,000) |  |
Sale and Issuance of common stock | 44,000 |  |  | 44,000 |  |
Sale and Issuance of common stock, net of issuance costs of $880k (in shares) |  | 12,230 |  |  |  |
Net loss | (10,445,537) |  |  |  | (10,446,000) |
Balance at Apr. 30, 2016 | $ 238,000 | $ 9,000 | $ (1,252,000) | $ 63,947,000 | $ (62,466,000) | $ 0
Balance (in shares) at Apr. 30, 2016 |  | 8,704,846 | 269,685 |  |  |

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