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Share-based compensation (Tables) | 6 Months Ended
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Jun. 30, 2021
Allocation of compensation expense related to options | The weighted-average grant-date fair value of the options granted in the six months ended June 30, 2021 and 2020 were $81.37 and $33.51 per share, respectively. The Group recorded compensation expense related to the options of $12,776 and $10,355 for the six months ended June 30, 2021 and 2020, respectively, which were classified in the accompanying unaudited condensed consolidated statements of operations as follows:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
|  | $ |  |  | $ |  |  | $ |  |  | $ |
Selling, general and administrative |  |  | 4,123 |  |  |  | 2,804 |  |  |  | 7,382 |  |  |  | 5,548 |
Research and development |  |  | 3,104 |  |  |  | 2,630 |  |  |  | 5,394 |  |  |  | 4,807 |
Total |  |  | 7,227 |  |  |  | 5,434 |  |  |  | 12,776 |  |  |  | 10,355 |
Allocation of compensation expense related to restricted shares | As of June 30, 2021, there was $40,562 of total unrecognized compensation expense related to non-vested restricted shares. The Group recorded compensation expense related to the restricted shares of $4,774 and $3,072 for the six months ended June 30, 2021 and 2020, respectively, which were classified in the accompanying unaudited condensed consolidated statements of operations as follows:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
|  | $ |  |  | $ |  |  | $ |  |  | $ |
Selling, general and administrative |  |  | 1,839 |  |  |  | 1,046 |  |  |  | 3,050 |  |  |  | 2,114 |
Research and development |  |  | 1,166 |  |  |  | 484 |  |  |  | 1,724 |  |  |  | 958 |
Total |  |  | 3,005 |  |  |  | 1,530 |  |  |  | 4,774 |  |  |  | 3,072 |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 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 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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