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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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