Earnings per share - Schedule of Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Basic Earnings Per Share
Net income/(loss)	$ (7,700)	$ (12,599)	$ 10,807
Less: Income attributable to preferred shareholders	0	0	(377)
Net income/(loss) available to common shareholders, basic	$ (7,700)	$ (12,599)	$ 10,430
Weighted-average shares outstanding – basic (in shares)	58,662	44,737	21,118
Basic earnings/(loss) per share (in dollars per share)	$ (0.13)	$ (0.28)	$ 0.49
Diluted Earnings Per Share
Net income available to common shareholders	$ (7,700)	$ (12,599)	$ 10,430
Basic weighted-average common shares outstanding (in shares)	58,662	44,737	21,118
Add: Dilutive impact of options in the money (in shares)	0	0	4
Weighted average number of shares outstanding - diluted (in shares)	58,662	44,737	21,122
Diluted earnings/(loss) per share (in dollars per share)	$ (0.13)	$ (0.28)	$ 0.49