Organization and significant accounting policies - Calculation of Basic and Diluted Shares (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Numerator:
Net loss	$ (66,427)	$ (139,805)	$ (8,908)
Net loss attributable to common shareholders	$ (66,427)	$ (139,805)	$ (8,908)
Denominator:
Weighted-average common shares outstanding (in shares)	43,719,185	42,481,027	38,503,944
Weighted-average common shares outstanding (in shares)	43,719,185	42,481,027	38,503,944
Basic (loss) earnings per common share (in dollars per share)	$ (1.52)	$ (3.29)	$ (0.23)
Diluted loss per common share (in dollars per share)	$ (1.52)	$ (3.29)	$ (0.23)