Sale of future royalties - Narrative (Details) - USD ($) $ in Thousands			9 Months Ended		12 Months Ended	72 Months Ended
	Jul. 02, 2019	Jan. 01, 2019	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2016	Jun. 30, 2025
Other Liabilities Disclosure [Line Items]
Non-cash royalty revenue			$ 1,223	$ 1,736
Non-cash interest expense			$ 78	98
Minimum
Other Liabilities Disclosure [Line Items]
Royalty interest, % interest			0.75%
Maximum
Other Liabilities Disclosure [Line Items]
Royalty interest, % interest			1.125%
OMERS
Other Liabilities Disclosure [Line Items]
Gross proceeds from sale of royalty interest. before advisory fees		$ 20,000
Entitlement of royalties to be received	$ 30,000	30,000
Future royalty payments	30,000	$ 30,000
Transaction costs on sale of royalties	$ 1,500
Effective annual interest rate on royalty liability			2.30%
Non-cash royalty revenue			$ 1,200	1,700		$ 26,300
Non-cash interest expense			$ 100	$ 100
OMERS \| Minimum
Other Liabilities Disclosure [Line Items]
Royalty interest, % interest	1.00%				1.00%
OMERS \| Maximum
Other Liabilities Disclosure [Line Items]
Royalty interest, % interest	2.33%				2.33%