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Share-based compensation - Summary of share-based compensation expense and unrecognized costs (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2024 | Mar. 31, 2023
Share-based compensation |  |  |
Authorized shares |  | 14 |
2014 Plan |  |  |
Share-based compensation |  |  |
Authorized shares |  | 14 |
Share-based compensation expense |  | $ 7,191 | $ 8,061
Unrecognized compensation costs |  | $ 48,804 |
Weighted-average remaining period for recognition (in years) |  | 2 years 2 months 23 days |
2014 Plans and ESPP |  |  |
Share-based compensation |  |  |
Share-based compensation expense |  | $ 7,191 | 8,061
Research and development expenses | 2014 Plans and ESPP |  |  |
Share-based compensation |  |  |
Share-based compensation expense |  | 3,425 | 4,305
Selling, general and administrative expense | 2014 Plans and ESPP |  |  |
Share-based compensation |  |  |
Share-based compensation expense |  | 3,421 | 3,732
Cost of manufacturing services revenues | 2014 Plans and ESPP |  |  |
Share-based compensation |  |  |
Share-based compensation expense |  | 345 | 24
Share options | 2014 Plan |  |  |
Share-based compensation |  |  |
Unrecognized compensation costs |  | $ 20,743 |
Weighted-average remaining period for recognition (in years) |  | 2 years 6 months 21 days |
Share options | 2014 Plans and ESPP |  |  |
Share-based compensation |  |  |
Share-based compensation expense |  | $ 2,913 | 3,274
Restricted share units ("RSUs") | 2014 Plan |  |  |
Share-based compensation |  |  |
Unrecognized compensation costs |  | $ 27,981 |
Weighted-average remaining period for recognition (in years) |  | 1 year 11 months 26 days |
Restricted share units ("RSUs") | 2014 Plans and ESPP |  |  |
Share-based compensation |  |  |
Share-based compensation expense |  | $ 4,370 | 4,630
Performance Share Awards | 2014 Plan |  |  |
Share-based compensation |  |  |
Unrecognized compensation costs |  | $ 80 |
Weighted-average remaining period for recognition (in years) |  | 7 months 9 days |
Performance Share Awards | 2014 Plans and ESPP |  |  |
Share-based compensation |  |  |
Share-based compensation expense |  | $ (99) | $ 150
Employee share purchase plan | Employee share purchase plan (ESPP) |  |  |
Share-based compensation |  |  |
Ordinary shares available for issue | 150,000 | 96,862 | 113,565
Discounted rate for purchase of shares | 85.00% |  |
Employee share purchase plan | 2014 Plans and ESPP |  |  |
Share-based compensation |  |  |
Share-based compensation expense |  | $ 7 | $ 7

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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