Annual report pursuant to Section 13 and 15(d)

Basis of Presentation (Details)

v3.24.3
Basis of Presentation (Details)
 1 Months Ended 12 Months Ended
Mar. 26, 2024
USD ($)
$ / shares
shares
Feb. 25, 2024
USD ($)
Dec. 31, 2023
USD ($)
shares
Dec. 07, 2023
USD ($)
shares
Nov. 29, 2023
shares
Sep. 30, 2023
USD ($)
$ / shares
shares
Aug. 04, 2023
USD ($)
shares
Oct. 07, 2022
shares
Aug. 31, 2024
USD ($)
shares
Jun. 30, 2024
USD ($)
$ / shares
shares
Jun. 30, 2023
USD ($)
$ / shares
Jun. 30, 2022
USD ($)
Net cash used in operating activities                   $ 18,554,000 $ 30,436,000  
Total current assets                   15,672,000 26,259,000  
Cash and cash equivalents                   14,210,000 4,301,000  
Net losses                   24,907,000 65,010,000  
Operating capital deficit                   18,600,000 30,400,000  
Proceeds from offering                   $ 25,523,000 $ 11,487,000  
Common stock, par value (in dollars per share) | $ / shares                   $ 0.001 $ 0.001  
Sale proceeds for intangible assets                   $ 1,000,000    
Proceeds from exercise of warrants                   4,464,000    
Total cash, cash equivalents and restricted cash                   14,425,000 $ 7,579,000 $ 28,672,000
Restricted cash, current                     $ 3,025,000  
Pre-split shares required for one post-split share of common stock | shares               25        
Cash and cash equivalents and marketable securities                   $ 14,400,000    
Subsequent Events                        
Proceeds from exercise of warrants                 $ 4,000      
Common Stock                        
Reverse stock split, shares received per share tendered         0.05     0.04        
Pre-split shares required for one post-split share of common stock | shares         20     25        
Pre-Funded Warrants                        
Number of warrants exercised | shares                   1,650,000    
Series C Warrants                        
Number of warrants exercised | shares                   1,178,500    
Series C Warrants | Subsequent Events                        
Number of warrants exercised | shares                 1,000      
Series D Warrants                        
Number of warrants exercised | shares                   1,053,500    
Series D Warrants | Subsequent Events                        
Number of warrants exercised | shares                 1,000      
At-The-Market Offerings                        
Shares issued | shares           170,989            
Proceeds from offering           $ 1,700,000            
Common stock, par value (in dollars per share) | $ / shares           $ 0.001            
Lincoln Park Purchase Agreement                        
Shares issued | shares     21,457       181,141          
Proceeds from offering     $ 100,000       $ 1,200,000          
Offering 2023                        
Shares issued | shares       600,000                
Proceeds from offering       $ 4,500,000                
Offering 2023 | Pre-Funded Warrants                        
Number of warrants issued | shares       1,650,000                
Warrants, shares of common stock issued upon conversion | shares       1,650,000                
Offering 2023 | Series C Warrants                        
Number of warrants issued | shares       2,250,000                
Warrants, shares of common stock issued upon conversion | shares       2,250,000                
Offering 2023 | Series D Warrants                        
Number of warrants issued | shares       2,250,000                
Warrants, shares of common stock issued upon conversion | shares       2,250,000                
2024 Securities Purchase Agreement | Private placement                        
Shares issued | shares 2,701,315                      
Common stock, gross proceeds from issuance $ 15,100,000                      
Common stock, net proceeds from issuance $ 14,100,000                      
Placement agent fees paid (as percentage) 6.00%                      
Reduced placement agent fee percentage 4.00%                      
Payment made to placement agent for legal fees and other out of pocket expenses $ 50,000                      
2024 Securities Purchase Agreement | Private placement | Common Stock                        
Common stock, net proceeds from issuance       $ 4,000,000                
2024 Securities Purchase Agreement | Private placement | Pre-Funded Warrants                        
Warrants, shares of common stock issued upon conversion | shares 2,585,963                      
Exercise price per share of warrants | $ / shares $ 0.0001                      
2024 Securities Purchase Agreement | Private placement | Series E Warrants                        
Warrants, shares of common stock issued upon conversion | shares 5,287,278                      
Exercise price per share of warrants | $ / shares $ 2.64                      
Warrants, exercisable term 5 years                      
2024 Securities Purchase Agreement | Private placement | Common Shares and Series E Warrants                        
Combined purchase price per share | $ / shares $ 2.85                      
2024 Securities Purchase Agreement | Private placement | Pre-funded and Series E Warrants                        
Combined purchase price per share | $ / shares $ 2.849                      
PD-1 Purchase Agreement                        
Sale proceeds for intangible assets   $ 1,000,000                    
Potential contingent payment   2,500,000                    
Second potential contingent payment   $ 50,000,000