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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)