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Share-based compensation - Summary of share-based compensation expense and unrecognized costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | May 31, 2018
2014 Plan |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Authorized shares |  | 8,601,471 |  | 8,601,471 |  | 3,000,000
Share-based compensation expense | $ 4,576 | $ 2,205 | $ 8,854 | $ 4,732 |  |
Increase in share-based compensation expense | 2,400 |  | 4,100 |  |  |
Unrecognized compensation costs | 38,517 |  | $ 38,517 |  |  |
Weighted-average remaining period for recognition (in years) |  |  | 2 years 7 months 28 days |  |  |
Research and development expenses | 2014 Plan |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Share-based compensation expense | 2,119 | 993 | $ 4,099 | 1,799 |  |
Selling, general and administrative expense | 2014 Plan |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Share-based compensation expense | 2,457 | 1,212 | 4,755 | 2,933 |  |
Share options | 2014 Plan |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Share-based compensation expense | $ 2,004 | 1,096 | $ 4,080 | 2,155 |  |
Outstanding of fully vested share options | 2,943,756 |  | 2,943,756 |  | 2,673,712 |
Unrecognized compensation costs | $ 21,695 |  | $ 21,695 |  |  |
Weighted-average remaining period for recognition (in years) |  |  | 3 years 29 days |  |  |
Share options | 2012 Plan |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Outstanding of fully vested share options | 14,000 |  | 14,000 |  | 32,567 |
Restricted share units ("RSUs") | 2014 Plan |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Share-based compensation expense | $ 995 | 540 | $ 1,925 | 1,286 |  |
Unrecognized compensation costs | 6,955 |  | $ 6,955 |  |  |
Weighted-average remaining period for recognition (in years) |  |  | 2 years 1 month 6 days |  |  |
Performance share units ("PSUs") | 2014 Plan |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Share-based compensation expense | 1,577 | $ 569 | $ 2,849 | $ 1,291 |  |
Unrecognized compensation costs | $ 9,867 |  | $ 9,867 |  |  |
Weighted-average remaining period for recognition (in years) |  |  | 2 years 1 month 13 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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition Number of shares authorized for issuance 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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