Stockholder's equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			9 Months Ended	38 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Dec. 31, 2024	Jun. 30, 2025	May 31, 2025	Oct. 31, 2024	Nov. 30, 2021
Subsidiary, Sale of Stock [Line Items]
Common stock, shares authorized (in shares)	300,000,000			300,000,000	150,000,000	300,000,000
At-The-Market
Subsidiary, Sale of Stock [Line Items]
Issuance of common stock, net (in shares)	2,950,225			2,950,225	15,318,264
Price per share (in dollars per share)	$ 2.62			$ 2.62	$ 5.54
Issuance and sale of common stock	$ 7,526	$ 10,280	$ 14,089	$ 7,500	$ 82,300
Maximum | At-The-Market
Subsidiary, Sale of Stock [Line Items]
Sale of stock, value authorized for sale								$ 200,000	$ 200,000
Common stock, shares authorized (in shares)							150,000,000