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Share-based compensation - Summary of share-based compensation expense and unrecognized costs (Details) - 2014 Plan - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
May 31, 2021 | Jun. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based compensation |  |  |  |  |  |
Increase in authorized shares | 8,601,471 | 12,601,471 |  |  |  |
Share-based compensation expense |  |  | $ 5,950 | $ 6,363 | $ 18,725 | $ 16,417
Unrecognized compensation costs |  |  | 55,198 |  | $ 55,198 |
Weighted-average remaining period for recognition (in years) |  |  |  |  | 2 years 6 months 25 days |
Research and development expenses |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Share-based compensation expense |  |  | 3,245 | 3,906 | $ 9,205 | 9,177
Selling, general and administrative expense |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Share-based compensation expense |  |  | 2,705 | 2,457 | 9,520 | 7,240
Share options |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Share-based compensation expense |  |  | 2,965 | 3,994 | 9,155 | 8,948
Unrecognized compensation costs |  |  | 31,952 |  | $ 31,952 |
Weighted-average remaining period for recognition (in years) |  |  |  |  | 2 years 11 months 4 days |
Restricted share units ("RSUs") |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Share-based compensation expense |  |  | 2,582 | 1,525 | $ 8,364 | 5,178
Unrecognized compensation costs |  |  | 21,887 |  | $ 21,887 |
Weighted-average remaining period for recognition (in years) |  |  |  |  | 2 years 1 month 28 days |
Performance share units ("PSUs") |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Share-based compensation expense |  |  | 403 | $ 844 | $ 1,206 | $ 2,291
Unrecognized compensation costs |  |  | $ 1,359 |  | $ 1,359 |
Weighted-average remaining period for recognition (in years) |  |  |  |  | 9 months 3 days |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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