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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, 2018 $ 1 $ (300) $ 208,233 $ (197,538) $ (160) $ 10,236
Balance, shares at Apr. 30, 2018 921,247 (3,701)        
Net loss       (12,246)   (12,246)
Stock based compensation     295     295
Issuance (forfeiture) of restricted stock, net      
Issuance (forfeiture) of restricted stock, net, shares (5,090)          
Exercise of prefunded warrants, net of issuance costs $ 3   17     20
Exercise of prefunded warrants, net of issuance costs shares 2,632,120          
Common stock issued for commitment fee- Aspire   295     295
Common stock issued for commitment fee- Aspire, shares 21,429          
Issuance of common stock- Aspire financing, net of issuance costs   593     593
Issuance of common stock- Aspire financing, net of issuance costs, shares 162,162          
Issuance of common stock- AGP At The Market offering, net of issuance costs   882     882
Issuance of common stock- AGP At The Market offering, net of issuance costs, shares 151,561          
Issuance of common stock, common and pre-funded warants, net of issuance costs $ 1   15,711     15,712
Issuance of common stock, common and pre-funded warants, net of issuance costs, shares 1,542,000          
Acquisition of treasury stock   $ (1)       (1)
Acquisition of treasury stock, shares   (89)        
Other comprehensive loss         (11) (11)
Other        
Other, shares 88 20        
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)
Stock 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 issuance costs $ 1   (17)     (16)
Exercise of prefunded warrants, net of issuance costs shares 753,560          
Common stock issued for commitment fee- Aspire $ 1   294     295
Common stock issued for commitment fee- Aspire, 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 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)