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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) | Total | Common Stock | Treasury Stock | Additional Paid-in Capital | Accumulated Deficit
--- | --- | --- | --- | --- | ---
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 and modification expense | 2,599,000 |  |  | 2,599,000 |
Exercise of options and warrants | (18,000) |  |  | (18,000) |
Exercise of options and warrants (in shares) |  | 0 |  |  |
Issuance of common stock for services | 44,000 |  |  | 44,000 |
Issuance of common stock (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)
Balance (in shares) at Apr. 30, 2016 |  | 8,704,846 | 269,685 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Stock-based compensation and modification expense | 2,662,000 |  |  | 2,662,000 |
Issuance of common stock for services | 44,000 |  |  | 44,000 |
Issuance of common stock (in shares) |  | 18,564 |  |  |
Sale of common stock, net of issuance costs of $742 | 4,340,000 | $ 2,000 | $ 0 | 4,338,000 | 0
Sale of common stock, net of issuance costs of $742 (in shares) |  | 2,258,749 | 0 |  |
Net loss | (6,883,882) |  |  |  | (6,884,000)
Balance at Apr. 30, 2017 | $ 400,000 | $ 11,000 | $ (1,252,000) | $ 70,991,000 | $ (69,350,000)
Balance (in shares) at Apr. 30, 2017 |  | 10,982,159 | 269,685 |  |

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