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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 (10,352) (10,352)
Share-based compensation 340 340
Issuance (forfeiture) of restricted stock, net
Issuance (forfeiture) of restricted stock, net, shares 64,928          
Exercise of prefunded warrants, net of costs $ 1 (17) (16)
Exercise of prefunded warrants, net of costs, shares 753,560        
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 1,020 1,021
Issuance of common stock- Aspire financing, net of issuance costs, shares 1,399,205          
Issuance of common stock- AGP At The Market offering, net of issuance costs $ 5 3,438 3,443
Issuance of common stock- AGP At The Market offering, net of issuance costs, shares 5,101,405          
Acquisition of treasury stock $ (1) (1)
Acquisition of treasury stock, shares (481)        
Other comprehensive gain/(loss) (12) (12)
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 (14,760) (14,760)
Share-based compensation 721 721
Proceeds from stock options exercises 184 184
Proceeds from stock options exercises, shares 175,500          
Exercise of common warrants, net of costs $ 1 2,818 2,819
Exercise of common warrants, net of costs, shares 732,500          
Issuance of common stock- Aspire financing, net of issuance costs $ 8 14,384 14,392
Issuance of common stock- Aspire financing, net of issuance costs, shares 8,747,251          
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          
Issuance of shares in acquisition 477 477
Issuance of shares in acquisition, shares 361,991          
Acquisition of treasury stock $ (36) (36)
Acquisition of treasury stock, shares (16,789)        
Other comprehensive gain/(loss) 12 12
Balance at Apr. 30, 2021 $ 52 $ (338) $ 315,821 $ (234,896) $ (171) $ 80,468
Balance, shares at Apr. 30, 2021 52,479,051 (21,040)