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Financial assets and liabilities - Additional Information (Details) - USD ($)
 1 Months Ended 6 Months Ended 12 Months Ended
Jan. 05, 2024
Mar. 08, 2023
Dec. 22, 2022
Nov. 19, 2021
Jun. 29, 2018
Nov. 30, 2021
Dec. 31, 2023
Dec. 31, 2022
Jun. 30, 2023
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Borrowings             $ 115,762,000   $ 108,763,000
Issuance warrants exercised period             7 years    
Financial assets             $ 84,619,000   82,399,000
Financial liabilities             145,050,000   151,533,000
Warrants fair value at issue date             1,000,000   $ 5,400,000
Gain (loss) on remeasurement of warrant liability             $ (4,400,000) $ (700,000)  
Level 3 | Unlisted Equity Securities                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Percentage of assets measured at fair value             100.00%   100.00%
Gross debt - fixed interest rates                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Borrowings             $ 121,999,000   $ 116,495,000
American Depositary Shares | Potential Ordinary Share Transactions                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Outstanding common share capital, percentage 1000.00%                
American Depository Receipt | Potential Ordinary Share Transactions                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Outstanding common share capital, percentage 500.00%                
Borrowings - Oaktree                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Borrowings principal amount           $ 90,000,000      
Borrowings term           5 years      
Borrowings       $ 60,000,000          
Borrowings, Interest Only Period           3 years      
Borrowings, interest rate           9.75%      
Percentage of principal amount payable over two year           40.00%      
Amortization period           2 years      
Unpaid Interest Portion Per Annum           1.75%      
Percentage of premium for volume-weighted average price     15.00% 15.00%          
Issuance warrants exercised period   7 years   7 years          
Remeasurement of borrowing arrangements within finance gains (loss)               (1,400,000)  
Finance costs loss on remeasurement due to additional warrants issued               1,000,000  
Finance costs loss on adjustment of carrying amount on financial liability               $ 400,000  
Borrowings - Oaktree | Refinancing and Expansion of Senior Debt Facility                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Percentage of share premium price               15.00%  
Warrant exercise term   7 years              
Borrowings - Oaktree | American Depositary Shares                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Exercise price (in australian dollars per share)     $ 3.70 $ 7.26   $ 7.26   $ 3.70  
Borrowings - Oaktree | American Depositary Shares | Potential Ordinary Share Transactions                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Exercise price (in australian dollars per share) $ 14.36                
Borrowings - Oaktree | American Depositary Shares | Refinancing and Expansion of Senior Debt Facility                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Exercise price (in australian dollars per share)               $ 3.70  
Borrowings - Oaktree | Warrants                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Number of warrants granted to purchase american depositary shares (in shares)     455,000 1,769,669          
Borrowings - Oaktree | Warrants | Refinancing and Expansion of Senior Debt Facility                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Number of warrants granted to purchase american depositary shares (in shares)               455,000  
Borrowings - Oaktree | November 2021 warrants                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Number of warrants issued to purchase american depositary shares           1,769,669      
Borrowings - Oaktree | November 2021 warrants | Potential Ordinary Share Transactions                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Number of warrants issued to purchase american depositary shares 884,838         884,838      
Borrowings - Oaktree | December 2022 warrants                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Number of warrants issued to purchase american depositary shares               455,000  
Borrowings - Oaktree | December 2022 warrants | Potential Ordinary Share Transactions                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Number of warrants issued to purchase american depositary shares 227,502                
Borrowings - Oaktree | December 2022 warrants | American Depositary Shares | Potential Ordinary Share Transactions                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Exercise price (in australian dollars per share) $ 7.24                
Borrowings - Oaktree | Tranche One                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Borrowings       $ 60,000,000   $ 60,000,000 30,000,000    
Borrowings, interest rate           9.75%      
Borrowings - Oaktree | Quarterly Payments                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Borrowings, interest rate           8.00%      
Borrowings - NovaQuest                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Remeasurement of borrowing arrangements within finance gains (loss)             (100,000) $ 200,000  
Percentage of entity's revenue, annual payment cap threshold         25.00%        
Borrowings - NovaQuest | Level 2                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Financial assets             0   0
Financial liabilities             0   0
Borrowings - NovaQuest | Level 1                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Financial assets             0   0
Financial liabilities             $ 0   $ 0
Borrowings - NovaQuest | Gross debt - fixed interest rates                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Borrowings principal amount         $ 40,000,000        
Borrowings term         8 years        
Borrowings, Interest Only Period         4 years        
Borrowings, interest rate         15.00%        
Borrowings - NovaQuest | Contingent Consideration Provision | Level 3                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Percentage of liabilities measured at fair value             100.00%   100.00%
Borrowings - NovaQuest | Tranche One | Gross debt - fixed interest rates                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Borrowings         $ 30,000,000        
Borrowings - NovaQuest | Tranche Two | Gross debt - fixed interest rates                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Borrowings         $ 10,000,000        
Oaktree Capital Management                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Minimum unrestricted cash balance             $ 35,000,000    
Top of Range                  
Disclosure Of Financial Assets And Liabilities [Line Items]                  
Trade receivables settlement period             60 days