Sale of future royalties - Narrative (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended	69 Months Ended
	Jul. 02, 2019	Jan. 01, 2019	Mar. 31, 2025	Mar. 31, 2024	Jun. 30, 2016	Mar. 31, 2025
Other Liabilities Disclosure [Line Items]
Non-cash royalty revenue			$ 448	$ 593
Non-cash interest expense			$ 28	36
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			2.20%
Non-cash royalty revenue			$ 400	600		$ (25,300)
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%