Basic and diluted earnings per share - Ordinary share (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net (loss) / income attributable to ordinary shares	$ (47,857)	$ (36,531)	$ (133,596)	$ 321,381
Weighted-average number of ordinary shares outstanding - basic	46,772,430	46,152,404	46,680,667	45,888,769
Weighted-average number of ordinary shares outstanding - diluted	46,772,430	46,152,404	46,680,667	46,780,963
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment arrangements				1,382
Stock options | Previous plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment arrangements				784,942
Non-vested RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment arrangements				105,870