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Subsequent events (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Apr. 14, 2023
Mar. 27, 2023
Feb. 13, 2023
Jan. 05, 2023
Oct. 27, 2022
Oct. 13, 2022
Aug. 05, 2022
Dec. 31, 2022
Apr. 14, 2023
Sep. 30, 2022
Sep. 30, 2021
Apr. 13, 2023
Oct. 26, 2022
Subsequent Event [Line Items]                          
Exercise of stock options (in shares)                   174,378      
Proceeds from issuance of common stock upon exercise of stock options                   $ 141,000 $ 66,000    
Proceeds from issuance of common stock                   $ 40,000,000 $ 0    
Lincoln Park Purchase Agreement [Member]                          
Subsequent Event [Line Items]                          
Issuance of common stock (in shares)             127,180     381,540      
Subsequent Event                          
Subsequent Event [Line Items]                          
Exercise of stock options (in shares)                 764,796        
Proceeds from issuance of common stock upon exercise of stock options                 $ 696,000        
ELOC, right to sell common stock                         $ 150,000,000
Subsequent Event | Term Loan and Security Agreement [Member]                          
Subsequent Event [Line Items]                          
Aggregate principal amount                       $ 50,000,000  
Subsequent Event | Tranche One [Member]                          
Subsequent Event [Line Items]                          
Aggregate principal amount                       15,000,000  
Proceeds from term loan $ 15,000,000                        
Subsequent Event | Tranche Two [Member]                          
Subsequent Event [Line Items]                          
Aggregate principal amount                       15,000,000  
Subsequent Event | Tranche Three [Member]                          
Subsequent Event [Line Items]                          
Aggregate principal amount                       $ 20,000,000  
Subsequent Event | Lincoln Park Purchase Agreement [Member]                          
Subsequent Event [Line Items]                          
Exercise of stock options (in shares)               598,368          
Proceeds from issuance of common stock upon exercise of stock options               $ 600,000          
Issuance of common stock (in shares)               13,239,654          
Proceeds from issuance of common stock               $ 15,700,000          
Maximum resale amount for registration statement relating purchase agreement     $ 35,000,000                    
Subsequent Event | Restricted Stock Units (RSUs) | Employees                          
Subsequent Event [Line Items]                          
Awards granted (in shares)   3,349,520   143,000 3,578,590 4,532,122              
Subsequent Event | Restricted Stock Units (RSUs) | Members of board of directors                          
Subsequent Event [Line Items]                          
Awards granted (in shares)         167,605