v3.26.3
Stockholders' equity (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 30, 2026
USD ($)
$ / shares
shares
Jan. 28, 2026
USD ($)
$ / shares
shares
Dec. 08, 2025
USD ($)
$ / shares
shares
Apr. 30, 2025
shares
Sep. 30, 2026
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
shares
Jun. 30, 2025
shares
Sep. 30, 2026
USD ($)
Vote
$ / shares
shares
Sep. 30, 2025
USD ($)
shares
Dec. 31, 2025
USD ($)
$ / shares
shares
Jun. 30, 2026
shares
Mar. 31, 2026
USD ($)
shares
Mar. 31, 2025
shares
Dec. 31, 2024
shares
Nov. 08, 2024
USD ($)
Common stock                              
Stock, shares authorized         440,000,000     440,000,000              
Common stock, shares authorized         400,000,000     400,000,000   400,000,000          
Common stock, par value (in dollars per share) | $ / shares         $ 0.001     $ 0.001   $ 0.001          
Preferred stock, shares authorized         40,000,000     40,000,000              
Preferred stock, par value (in dollars per share) | $ / shares         $ 0.001     $ 0.001              
Number of voting rights per common share | Vote               1              
Stock based compensation expense | $         $ 100,000 $ 100,000   $ 300,000 $ 400,000            
Shelf Registration Statement                              
Proceeds from issuance of common stock | $               35,598,881 834,397            
Common stock issuance costs | $               2,912,439 35,729            
Private Placement                              
Common stock issuance costs | $               2,912,439 $ 35,729            
Warrant exercises | $               $ 342,000              
December 2025 Warrants                              
Private Placement                              
Common stock with an exercise price | $ / shares         $ 1.04     $ 1.04              
January 2026 Warrants                              
Private Placement                              
Common stock with an exercise price | $ / shares         0.765     0.765              
March 2026 Warrants                              
Private Placement                              
Common stock with an exercise price | $ / shares         $ 0.683     $ 0.683              
Common Stock                              
Common stock                              
Conversion of preferred stock into common stock (in shares)       12,516                      
Series A Convertible Preferred Stock                              
Common stock                              
Convertible preferred stock, shares outstanding         31,194 31,194 31,194 31,194 31,194 31,194 31,194 31,194 56,227 56,227  
Number of shares remained to be converted into common stock         15,596     15,596   15,596          
Conversion of preferred stock into common stock (in shares)       25,033     25,033                
Private Placement | Pre-funded Warrants                              
Private Placement                              
Warrants to purchase of shares         39,799,626     39,799,626              
Private Placement | Tranche A Warrants (Pre-funded Warrants Exercise Price 7.29 Per Share)                              
Private Placement                              
Class of warrant or right, number of warrants exercised               0   0          
Private Placement | Tranche B Warrants (Pre-funded Warrants Exercise Price 9.1125 Per Share)                              
Private Placement                              
Class of warrant or right, number of warrants exercised               0   0          
March 2024 Private Placement | Pre-funded Warrants                              
Private Placement                              
Warrant exercises | $                   $ 91          
Class of warrant or right, number of warrants exercised                   91,206          
December 2025 Private Placement | Pre-funded Warrants                              
Private Placement                              
Warrant exercises | $               $ 0   $ 0          
Class of warrant or right, number of warrants exercised               1,376,405   1,198,700          
December 2025 Private Placement | Purchasers | Securities purchase agreement                              
Shelf Registration Statement                              
Shares issued     26,459                        
Common stock issuance costs | $     $ 400,000                        
Private Placement                              
Issuance of common stock (in shares)     26,459                        
Offering price per share | $ / shares     $ 1.165                        
Stock issuance anniversary period     5 years                        
Proceeds from sale of common stock in a private placement | $     $ 3,100,000                        
Common stock issuance costs | $     $ 400,000                        
December 2025 Private Placement | Purchasers | Securities purchase agreement | Pre-funded Warrants                              
Private Placement                              
Offering price per share | $ / shares     $ 1.164                        
Warrants to purchase of shares     2,596,564                        
Common stock with an exercise price | $ / shares     $ 0.001                        
December 2025 Private Placement | Purchasers | Securities purchase agreement | December 2025 Warrants                              
Private Placement                              
Warrants to purchase of shares     2,880,533                        
Common stock with an exercise price | $ / shares     $ 1.04                        
December 2025 Private Placement | Placement Agent | Securities purchase agreement | December 2025 Warrants                              
Private Placement                              
Warrants to purchase of shares     257,510                        
January 2026 Private Placement | Pre-funded Warrants                              
Private Placement                              
Warrant exercises | $         $ 0     $ 0              
Class of warrant or right, number of warrants exercised         800,000     1,723,596              
January 2026 Private Placement | Purchasers | Securities purchase agreement                              
Shelf Registration Statement                              
Shares issued   1,877,677                          
Common stock issuance costs | $   $ 500,000                          
Private Placement                              
Issuance of common stock (in shares)   1,877,677                          
Offering price per share | $ / shares   $ 0.8891                          
Common stock issuance costs | $   $ 500,000                          
Issuance of gross proceeds | $   $ 5,600,000                          
January 2026 Private Placement | Purchasers | Securities purchase agreement | Pre-funded Warrants                              
Private Placement                              
Offering price per share | $ / shares   $ 0.8881                          
Warrants to purchase of shares   4,411,180                          
Common stock with an exercise price | $ / shares   $ 0.001                          
January 2026 Private Placement | Purchasers | Securities purchase agreement | January 2026 Warrants                              
Private Placement                              
Warrants to purchase of shares   6,288,857                          
Common stock with an exercise price | $ / shares   $ 0.765                          
Stock issuance anniversary period   2 years                          
March 2026 Private Placement                              
Private Placement                              
Subscription receivable | $                       $ 500,000      
March 2026 Private Placement | Pre-funded Warrants                              
Private Placement                              
Warrant exercises | $         $ 500     $ 500              
Class of warrant or right, number of warrants exercised         500,000     500,000              
March 2026 Private Placement | March 2026 Warrants                              
Private Placement                              
Warrant exercises | $         $ 300,000     $ 300,000              
Class of warrant or right, number of warrants exercised         500,000     500,000              
March 2026 Private Placement | Purchasers | Securities purchase agreement                              
Shelf Registration Statement                              
Common stock issuance costs | $ $ 2,400,000                            
Private Placement                              
Common stock issuance costs | $ 2,400,000                            
Issuance of gross proceeds | $ $ 30,000,000                            
March 2026 Private Placement | Purchasers | Securities purchase agreement | Pre-funded Warrants                              
Private Placement                              
Offering price per share | $ / shares $ 0.807                            
Warrants to purchase of shares 37,174,713                            
Common stock with an exercise price | $ / shares $ 0.001                            
March 2026 Private Placement | Purchasers | Securities purchase agreement | March 2026 Warrants                              
Private Placement                              
Warrants to purchase of shares 37,174,713                            
Common stock with an exercise price | $ / shares $ 0.683                            
2024 Shelf Registration Statement                              
Shelf Registration Statement                              
Maximum amount to be issued under at-the-market offering program, supplement | $                             $ 3,000,000
2024 Shelf Registration Statement | HCW                              
Shelf Registration Statement                              
Maximum amount to be issued under at-the-market offering program | $                             $ 3,000,000
2024 ATM offering                              
Shelf Registration Statement                              
Shares issued               0   1,337,948          
Proceeds from issuance of common stock | $                   $ 1,900,000          
Common stock issuance costs | $                   $ 76,000          
Private Placement                              
Issuance of common stock (in shares)               0   1,337,948          
Common stock issuance costs | $                   $ 76,000