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Share based compensation - Narrative (Details) $ in Thousands	12 Months Ended		69 Months Ended
	Dec. 31, 2023 USD ($) Rate shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2022 shares	Aug. 15, 2022	Jul. 24, 2012 shares	Sep. 18, 2006 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number granted (in shares)	7,376,000	9,024,000
Number of ordinary shares per ADS	800.00%			8
Fair value for instruments granted during period | $	$ 13,200	$ 5,900
EMI Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number granted (in shares)			0
Pre-IPO Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number granted (in shares)			0
Share Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contract life	10 years
Share Options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year
Share Options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Share Options | EMI Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized						114,000
Number of American Depository Shares authorized						14,250
Further awards to be granted (in shares)	0
Share Options | Pre-IPO Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized					1,320,000
Number of American Depository Shares authorized					165,000
Further awards to be granted (in shares)	0
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic and fair value, vested | $	$ 41,500	$ 14,300
Cost related to share options and RSUs granted but not yet recognized | $	$ 20,000
Expected period for recognition	1 year 10 months 24 days
Performance Restricted Stock Unit (PRSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic and fair value, vested | $	$ 26,665
Cost related to share options and RSUs granted but not yet recognized | $	$ 17,800
Expected period for recognition	1 year

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