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Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Common Shares [Member] | Treasury Shares [Member] | Additional Paid-In Capital [Member] | Stock Subscription Receivable [Member] | Accumulated Deficit [Member] | Accumulated Other Comprehensive Loss [Member] | Total
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Apr. 30, 2019 | $ 5 | $ (301) | $ 226,026 |  | $ (209,784) | $ (171) | $ 15,775
Balance, shares at Apr. 30, 2019 | 5,425,517 | (3,770) |  |  |  |  |
Net loss |  |  |  |  | (9,133) |  | (9,133)
Share-based compensation |  |  | 225 |  |  |  | 225
Issuance (forfeiture) of restricted stock, net |  |  |  |  |  |  |
Issuance (forfeiture) of restricted stock, net, shares | 64,928 |  |  |  |  |  |
Exercise of prefunded warrants, net of issuance costs | $ 1 |  | (16) |  |  |  | (15)
Exercise of prefunded warrants, net of issuance costs shares | 614,280 |  |  |  |  |  |
Common stock issued for commitment fee | $ 1 |  | 294 |  |  |  | 295
Common stock issued for commitment fee, shares | 194,805 |  |  |  |  |  |
Issuance of common stock- Aspire financing, net of issuance costs | $ 1 |  | 849 |  |  |  | 850
Issuance of common stock- Aspire financing, net of issuance costs, shares | 1,024,205 |  |  |  |  |  |
Issuance of common stock- AGP At The Market offering, net of issuance costs | $ 1 |  | 1,790 |  |  |  | 1,791
Issuance of common stock- AGP At The Market offering, net of issuance costs, shares | 1,375,584 |  |  |  |  |  |
Acquisition of treasury stock |  | $ (1) |  |  |  |  | $ (1)
Acquisition of treasury stock, shares |  | (481) |  |  |  |  | 481
Other comprehensive gain/(loss) |  |  |  |  |  | (12) | $ (12)
Balance at Jan. 31, 2020 | $ 9 | $ (302) | 229,167 |  | (218,917) | (184) | 9,774
Balance, shares at Jan. 31, 2020 | 8,699,319 | (4,251) |  |  |  |  |
Balance at Oct. 31, 2019 | $ 7 | $ (302) | 227,214 |  | (215,998) | (173) | 10,749
Balance, shares at Oct. 31, 2019 | 6,489,668 | (4,251) |  |  |  |  |
Net loss |  |  |  |  | (2,919) |  | (2,919)
Share-based compensation |  |  | 56 |  |  |  | 56
Issuance (forfeiture) of restricted stock, net |  |  |  |  |  |  |
Issuance (forfeiture) of restricted stock, net, shares | 65,060 |  |  |  |  |  |
Exercise of prefunded warrants, net of issuance costs |  |  | 2 |  |  |  | 2
Exercise of prefunded warrants, net of issuance costs shares | 264,280 |  |  |  |  |  |
Issuance of common stock- Aspire financing, net of issuance costs | $ 1 |  | 849 |  |  |  | 850
Issuance of common stock- Aspire financing, net of issuance costs, shares | 1,024,205 |  |  |  |  |  |
Issuance of common stock- AGP At The Market offering, net of issuance costs | $ 1 |  | 1,045 |  |  |  | $ 1,046
Issuance of common stock- AGP At The Market offering, net of issuance costs, shares | 856,106 |  |  |  |  |  |
Acquisition of treasury stock, shares |  |  |  |  |  |  |
Other comprehensive gain/(loss) |  |  |  |  |  | (11) | $ (11)
Balance at Jan. 31, 2020 | $ 9 | $ (302) | 229,167 |  | (218,917) | (184) | 9,774
Balance, shares at Jan. 31, 2020 | 8,699,319 | (4,251) |  |  |  |  |
Balance at Apr. 30, 2020 | $ 13 | $ (302) | 231,101 |  | (220,136) | (183) | 10,493
Balance, shares at Apr. 30, 2020 | 12,939,420 | (4,251) |  |  |  |  |
Net loss |  |  |  |  | (9,560) |  | (9,560)
Share-based compensation |  |  | 338 |  |  |  | 338
Proceeds from stock options exercises |  |  | 184 | (144) |  |  | 40
Proceeds from stock options exercises, shares | 175,500 |  |  |  |  |  |
Exercise of common warrants, net of costs | $ 1 |  | 2,607 | (1,839) |  |  | 769
Exercise of common warrants, net of costs, shares | 677,500 |  |  |  |  |  |
Issuance of common stock- Aspire financing, net of issuance costs | $ 7 |  | 9,976 |  |  |  | 9,983
Issuance of common stock- Aspire financing, net of issuance costs, shares | 7,275,000 |  |  |  |  |  |
Issuance of common stock- AGP At The Market offering, net of issuance costs | $ 30 |  | 66,136 |  |  |  | 66,166
Issuance of common stock- AGP At The Market offering, net of issuance costs, shares | 29,522,389 |  |  |  |  |  |
Acquisition of treasury stock |  | $ (36) |  |  |  |  | $ (36)
Acquisition of treasury stock, shares |  | (16,789) |  |  |  |  | 16,789
Other comprehensive gain/(loss) |  |  |  |  |  | 6 | $ 6
Balance at Jan. 31, 2021 | $ 51 | $ (338) | 310,342 | (1,983) | (229,696) | (177) | 78,199
Balance, shares at Jan. 31, 2021 | 50,589,809 | (21,040) |  |  |  |  |
Balance at Oct. 31, 2020 | $ 24 | $ (302) | 240,782 |  | (226,545) | (175) | 13,784
Balance, shares at Oct. 31, 2020 | 24,153,554 | (4,251) |  |  |  |  |
Net loss |  |  |  |  | (3,151) |  | (3,151)
Share-based compensation |  |  | 115 |  |  |  | 115
Proceeds from stock options exercises |  |  | 184 | (144) |  |  | 40
Proceeds from stock options exercises, shares | 175,500 |  |  |  |  |  |
Exercise of common warrants, net of costs | $ 1 |  | 2,607 | (1,839) |  |  | 769
Exercise of common warrants, net of costs, shares | 677,500 |  |  |  |  |  |
Issuance of common stock- Aspire financing, net of issuance costs | $ 2 |  | 6,740 |  |  |  | 6,742
Issuance of common stock- Aspire financing, net of issuance costs, shares | 1,750,000 |  |  |  |  |  |
Issuance of common stock- AGP At The Market offering, net of issuance costs | $ 24 |  | 59,914 |  |  |  | 59,938
Issuance of common stock- AGP At The Market offering, net of issuance costs, shares | 23,833,255 |  |  |  |  |  |
Acquisition of treasury stock |  | $ (36) |  |  |  |  | $ (36)
Acquisition of treasury stock, shares |  | (16,789) |  |  |  |  | 16,789
Other comprehensive gain/(loss) |  |  |  |  |  | (2) | $ (2)
Balance at Jan. 31, 2021 | $ 51 | $ (338) | $ 310,342 | $ (1,983) | $ (229,696) | $ (177) | $ 78,199
Balance, shares at Jan. 31, 2021 | 50,589,809 | (21,040) |  |  |  |  |

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