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Significant accounting policies - Additional Information (Detail)
 6 Months Ended
Jan. 16, 2023
AUD ($)
$ / shares
shares
Dec. 31, 2022
AUD ($)
Dec. 31, 2021
AUD ($)
Jan. 03, 2023
USD ($)
Jun. 30, 2022
AUD ($)
May 01, 2022
USD ($)
Jun. 30, 2021
AUD ($)
Disclosure of summary of significant accounting policies [line items]              
Consolidated loss after income tax   $ 13,586,027 $ 13,201,848        
Net cash outflows from operating activities   8,806,148 11,391,410        
Consolidated cash in hand and at bank   4,390,523 15,188,957   $ 7,361,112   $ 27,586,760
Proceeds From Issuing Shares   5,850,869 $ 16,700        
At The Market Equity Program [Member]              
Disclosure of summary of significant accounting policies [line items]              
Aggregate offering           $ 35,000,000  
American Depository Shares [Member] | At The Market Equity Program [Member]              
Disclosure of summary of significant accounting policies [line items]              
Number of shares represented by one depositary receipt           10  
Proceeds From Issuing Shares   $ 9,560,357          
Deposit Recieved [Member] | Labcorp Early Development Laboratories Inc [Member]              
Disclosure of summary of significant accounting policies [line items]              
Deposits       $ 428,096      
Major Ordinary Share Transactions [Member] | Share Purchase Plan [Member]              
Disclosure of summary of significant accounting policies [line items]              
Proceeds from issue of ordinary shares $ 4,500,000            
Major Ordinary Share Transactions [Member] | Share Purchase Plan [Member] | Unconditional Placement [Member]              
Disclosure of summary of significant accounting policies [line items]              
Proceeds from issue of ordinary shares $ 2,792,572            
Par value per share | $ / shares $ 0.11            
Major Ordinary Share Transactions [Member] | Share Purchase Plan [Member] | Conditional Placement [Member]              
Disclosure of summary of significant accounting policies [line items]              
Proceeds from issue of ordinary shares $ 1,707,428            
Par value per share | $ / shares $ 0.11            
Top of range [member] | Major Ordinary Share Transactions [Member] | Share Purchase Plan [Member]              
Disclosure of summary of significant accounting policies [line items]              
Number of shares issued | shares 30,000