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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Common Shares [Member] | Treasury Shares [Member] | Additional Paid-In Capital [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 |  |  |  | (6,214) |  | (6,214)
Stock based compensation |  |  | 168 |  |  | 168
Issuance (forfeiture) of restricted stock, net |  |  |  |  |  |
Issuance (forfeiture) of restricted stock, net, shares | (132) |  |  |  |  |
Exercise of prefunded warrants, net of issuance costs | $ 1 |  | (19) |  |  | (18)
Exercise of prefunded warrants, net of issuance costs shares | 350,000 |  |  |  |  |
Common stock issued for commitment fee |  |  | 294 |  |  | 294
Common stock issued for commitment fee, shares | 194,805 |  |  |  |  |
Issuance of common stock- AGP At The Market offering, net of issuance costs | $ 1 |  | 745 |  |  | 746
Issuance of common stock- AGP At The Market offering, net of issuance costs, shares | 519,478 |  |  |  |  |
Acquisition of treasury stock |  | $ (1) |  |  |  | $ (1)
Acquisition of treasury stock, shares |  | (481) |  |  |  |
Other comprehensive gain/(loss) |  |  |  |  | $ (2) | $ (2)
Balance at Oct. 31, 2019 | $ 7 | $ (302) | 227,214 | (215,998) | (173) | 10,748
Balance, shares at Oct. 31, 2019 | 6,489,668 | (4,251) |  |  |  |
Balance at Jul. 31, 2019 | $ 6 | $ (302) | 226,099 | (212,809) | (166) | 12,828
Balance, shares at Jul. 31, 2019 | 5,775,385 | (4,251) |  |  |  |
Net loss |  |  |  | (3,189) |  | (3,189)
Stock based compensation |  |  | 76 |  |  | 76
Common stock issued for commitment fee |  |  | $ 294 |  |  | $ 294
Common stock issued for commitment fee, shares | 194,805 |  |  |  |  |
Issuance of common stock- AGP At The Market offering, net of issuance costs | $ 1 |  | $ 745 |  |  | $ 746
Issuance of common stock- AGP At The Market offering, net of issuance costs, shares | 519,478 |  |  |  |  |
Other comprehensive gain/(loss) |  |  |  |  | (7) | (7)
Balance at Oct. 31, 2019 | $ 7 | $ (302) | 227,214 | (215,998) | (173) | 10,748
Balance, shares at Oct. 31, 2019 | 6,489,668 | (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 |  |  |  | (6,409) |  | (6,409)
Stock based compensation |  |  | 223 |  |  | 223
Issuance of common stock- AGP At The Market offering, net of issuance costs | $ 6 |  | 6,088 |  |  | 6,094
Issuance of common stock- AGP At The Market offering, net of issuance costs, shares | 5,689,134 |  |  |  |  |
Other comprehensive gain/(loss) |  |  |  |  | 8 | 8
Issuance of common stock- Aspire financing, net of issuance costs | $ 5 |  | 3,236 |  |  | 3,241
Issuance of common stock- Aspire financing, net of issuance costs, shares | 5,525,000 |  |  |  |  |
Balance at Oct. 31, 2020 | $ 24 | $ (302) | 240,648 | (226,545) | (175) | 13,650
Balance, shares at Oct. 31, 2020 | 24,153,554 | (4,251) |  |  |  |
Balance at Jul. 31, 2020 | $ 19 | $ (302) | 234,089 | (223,521) | (168) | 10,117
Balance, shares at Jul. 31, 2020 | 18,624,816 | (4,251) |  |  |  |
Net loss |  |  |  | (3,024) |  | (3,024)
Stock based compensation |  |  | 107 |  |  | 107
Issuance of common stock- AGP At The Market offering, net of issuance costs | $ 5 |  | 5,846 |  |  | 5,851
Issuance of common stock- AGP At The Market offering, net of issuance costs, shares | 5,028,738 |  |  |  |  |
Other comprehensive gain/(loss) |  |  |  |  | (7) | (7)
Issuance of common stock- Aspire financing, net of issuance costs |  |  | 606 |  |  | 606
Issuance of common stock- Aspire financing, net of issuance costs, shares | 500,000 |  |  |  |  |
Balance at Oct. 31, 2020 | $ 24 | $ (302) | $ 240,648 | $ (226,545) | $ (175) | $ 13,650
Balance, shares at Oct. 31, 2020 | 24,153,554 | (4,251) |  |  |  |

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