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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands | Total | Common Stock | Treasury Stock | Additional Paid-in Capital | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Balance at Apr. 30, 2016 | $ 238 | $ 9 | $ (1,252) | $ 63,947 | $ (62,466)
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 |  |  | 2,662 |
Issuance of common stock for services | 44 |  |  | 44 |
Issuance of common stock (in shares) |  | 18,564 |  |  |
Issuance of common stock on exercise of stock options | 4,340 | $ 2 |  | 4,338 |
Sale of common stock, net of issuance costs of $742 (in shares) |  | 2,258,749 |  |  |
Net loss | (6,884) |  |  |  | (6,884)
Balance at Apr. 30, 2017 | 400 | $ 11 | $ (1,252) | 70,991 | (69,350)
Balance (in shares) at Apr. 30, 2017 |  | 10,982,159 | 269,685 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Stock-based compensation and modification expense | 1,004 |  |  | 1,004 |
Issuance of common stock for services | 37 |  |  | 37 |
Issuance of common stock (in shares) |  | 8,569 |  |  |
Issuance of common stock on exercise of stock options | 38 | $ 0 | $ 0 | 38 | 0
Sale of common stock, net of issuance costs of $742 (in shares) |  | 12,500 | 0 |  |
Net loss | (1,476) |  |  |  | (1,476)
Balance at Apr. 30, 2018 | $ 3 | $ 11 | $ (1,252) | $ 72,070 | $ (70,826)
Balance (in shares) at Apr. 30, 2018 |  | 11,003,228 | 269,685 |  |

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