Financial risk management - Additional Information (Details) - USD ($)	6 Months Ended	12 Months Ended
	Dec. 31, 2025	Jun. 30, 2025
Disclosure of Financial Risk Management [Line Items]
Percentage of forecast net sales	20.00%
Non-cancellable purchase commitments related to raw materials, manufacturing agreements and other goods and services	$ 6,600,000
Other purchase commitments	0
Lonza Bioscience Singapore Pte. Ltd \| Manufacturing Service Agreement
Disclosure of Financial Risk Management [Line Items]
Minimum remaining financial commitment of non-lease component on exercise of option to extend non-cancellable term	35,800,000
Minimum financial commitment of lease component on exercise of option to extend non-cancellable term	$ 3,300,000
Contingent consideration
Disclosure of Financial Risk Management [Line Items]
Expected Term		12 months
Interest Rate Risk
Disclosure of Financial Risk Management [Line Items]
Effect on profit from change in interest rates	10.00%	10.00%
Liquidity Risk
Disclosure of Financial Risk Management [Line Items]
Non interest bearing financial liabilities maturity period	6 months	6 months
USD \| Currency Risk
Disclosure of Financial Risk Management [Line Items]
Percentage of cash held	78.00%	80.00%
AUD \| Currency Risk
Disclosure of Financial Risk Management [Line Items]
Percentage of cash held	21.00%	20.00%
Other Currency \| Currency Risk
Disclosure of Financial Risk Management [Line Items]
Percentage of cash held	1.00%