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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 |  |  |  |  |  |  |  |  |  |

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- Definition Percentage of liabilities measured at fair value. + References No definition available. + Details
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- Definition Percentage of premium for volume-weighted average price + References No definition available. + Details
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- Definition Warrants fair value at issue date. + References No definition available. + Details
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