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Financial Assets and Liabilities - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Nov. 19, 2021
Nov. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Jun. 30, 2022
Oct. 31, 2019
Sep. 19, 2019
Aug. 01, 2019
Jun. 30, 2019
Jan. 31, 2019
Jun. 29, 2018
Mar. 31, 2018
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Other non-current assets     $ 1,902,000   $ 1,930,000              
Interest-bearing deposits at call held as security     400,000   400,000              
Borrowings     99,675,000   96,634,000              
Financial assets     93,110,000   68,538,000              
Financial liabilities     141,425,000   145,182,000              
Warrants fair value at issue date $ 8,081,000   2,600,000   2,200,000              
Gain on remeasurement of warrant liability     400,000   5,900,000              
Level 1                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Financial assets     0   0              
Financial liabilities     0   0              
Level 2                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Financial assets     0   0              
Financial liabilities     $ 0   $ 0              
Unlisted Equity Securities | Level 3                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Percentage of assets measured at fair value     100.00%   100.00%              
Fixed interest rate [member]                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Borrowings     $ 109,632,000   $ 106,905,000              
Warrants                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Number of warrants granted to purchase American Depositary Shares     1,769,669                  
Contingent Consideration Provision | Level 3                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Percentage of liabilities measured at fair value     100.00%   100.00%              
Oaktree Capital Management, L.P.                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Borrowings principal amount   $ 90,000,000.0                    
Borrowings $ 60,000,000.0                      
Percentage of premium for volume-weighted average price 15.00%                      
Issuance warrants exercised period 7 years                      
Date of warrants legally issued Jan. 11, 2022                      
Remeasurement of borrowing arrangements within finance gains (Loss)       $ 0                
Minimum unrestricted cash balance     $ 35,000,000.0                  
Oaktree Capital Management, L.P. | Warrants                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Number of warrants granted to purchase American Depositary Shares 1,769,669                      
Oaktree Capital Management, L.P. | American Depositary Shares                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Par value per share $ 7.26                      
Oaktree Capital Management, L.P. | Tranche One                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Borrowings $ 60,000,000.0 60,000,000.0                    
Hercules Capital Inc                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Remeasurement of borrowing arrangements within finance gains (Loss)       400,000                
Hercules Capital Inc | Floating Interest Rate                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Borrowings principal amount                       $ 75,000,000.0
Borrowings, interest rate           9.70% 9.95% 10.20% 10.45%     9.45%
Hercules Capital Inc | Terms of Loan Agreement | Floating Interest Rate                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Borrowings, interest rate     9.70%                  
Hercules Capital Inc | Tranche One                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Repayment of borrowings   55,500,000                    
Hercules Capital Inc | Tranche One | Floating Interest Rate                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Borrowings                       $ 35,000,000.0
NovaQuest Capital Management, L.L.C.                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Remeasurement of borrowing arrangements within finance gains (Loss)     $ 100,000 $ 100,000                
Description of repayment of borrowings     repayments commence based on a percentage of net sales and are limited by a payment cap which is equal to the principal due for the next 12 months, plus accumulated unpaid principal and accrued unpaid interest. During the four-year period commencing July 8, 2022, principal amortizes in equal quarterly instalments payable only after approval and first commercial sales. If in any quarterly period, 25% of net sales of remestemcel-L for pediatric SR-aGVHD exceed the annual payment cap, the Group will pay the payment cap and an additional portion of excess sales which will be used towards the prepayment amount in the event there is an early prepayment of the loan. If in any quarterly period 25% of net sales of remestemcel-L for pediatric SR-aGVHD is less than the annual payment cap, then the payment is limited to 25% of net sales of remestemcel-L for pediatric SR-aGVHD. Any unpaid interest will be added to the principal amounts owing and shall accrue further interest. At maturity date, any unpaid loan balances are repaid.                  
NovaQuest Capital Management, L.L.C. | Fixed interest rate [member]                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Borrowings principal amount                     $ 40,000,000.0  
Borrowings, interest rate                     15.00%  
Borrowings, maturity     July 8, 2026                  
Borrowings term     8 years                  
Borrowings, interest rate basis     The loan term includes an interest only period of approximately four years through until July 8, 2022, then a four-year amortization period through until maturity on July 8, 2026. All interest and principal payments will be deferred until after the first commercial sale of remestemcel-L for the treatment in pediatric patients with SR-aGVHD. Principal is repayable in equal quarterly instalments over the amortization period of the loan and is subject to the payment cap described below. The loan has a fixed interest rate of 15% per annum.                  
NovaQuest Capital Management, L.L.C. | Tranche One | Fixed interest rate [member]                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Borrowings                     $ 30,000,000.0  
Refinancing and Expansion of Senior Debt Facility | Oaktree Capital Management, L.P.                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Borrowings principal amount   $ 90,000,000.0                    
Borrowings, interest rate   9.75%                    
Percentage of principal amount payable over two year   40.00%                    
Refinancing and Expansion of Senior Debt Facility | Oaktree Capital Management, L.P. | Tranche One                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Borrowings   $ 60,000,000.0                    
Refinancing and Expansion of Senior Debt Facility | Oaktree Capital Management, L.P. | Tranche Two                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Borrowings   $ 30,000,000.0                    
Refinancing and Expansion of Senior Debt Facility | Oaktree Capital Management, L.P. | Quarterly Payments                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Borrowings, interest rate   8.00%                    
Refinancing and Expansion of Senior Debt Facility | Oaktree Capital Management, L.P. | Unpaid Interest                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Borrowings, interest rate   1.75%                    
Refinancing and Expansion of Senior Debt Facility | Hercules Capital Inc | Tranche One                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Repayment of borrowings   $ 55,500,000                    
Potential Ordinary Share Transactions | Hercules Capital Inc | Tranche Two | Floating Interest Rate                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Borrowings                   $ 15,000,000.0    
Top of Range                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Trade receivables settlement period     60 days                  
Top of Range | Refinancing and Expansion of Senior Debt Facility | Oaktree Capital Management, L.P.                        
Disclosure Of Financial Assets And Liabilities [Line Items]                        
Borrowings, maturity   November 2026