Stockholder's equity (Details) - At-the-market offerings - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		12 Months Ended		14 Months Ended
	Oct. 31, 2024	Nov. 30, 2021	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024
Equity Distribution Agreement with Cowen and Company, LLC
Subsidiary, Sale of Stock [Line Items]
Issuance of common stock, net (in shares)			4,132,122	11,186,142	15,318,264
Proceeds from issuance of common stock			$ 24.4	$ 57.7	$ 82.3
Price per share (in dollars per share)			$ 5.54		$ 5.54
Maximum | Equity Distribution Agreement with Cowen and Company, LLC
Subsidiary, Sale of Stock [Line Items]
Issuance and sale of common stock		$ 200.0
Maximum | Equity Distribution Agreement With TD Securities (USA) LLC
Subsidiary, Sale of Stock [Line Items]
Issuance and sale of common stock	$ 200.0