Earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share
Net loss	$ (36,388)	$ (25,296)	$ (31,410)	$ (25,772)	$ (61,684)	$ (57,182)
Weighted-average number of shares outstanding - basic	276,355,000		275,632,000		276,309,000	275,563,000
Weighted-average number of shares outstanding - diluted	276,355,000		275,632,000		276,309,000	275,563,000
Net loss per share basic (in dollars per share)	$ (0.13)		$ (0.11)		$ (0.22)	$ (0.21)
Net loss per share diluted (in dollars per share)	$ (0.13)		$ (0.11)		$ (0.22)	$ (0.21)
Penny warrants included in Net loss per share calculation - basic and diluted (in shares)	6,900		6,600		6,900	6,600