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Share-based compensation (Tables) | 9 Months Ended
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Sep. 30, 2021
Allocation of compensation expense related to options | The weighted-average grant-date fair value of the options granted in the nine months ended September 30, 2021 and 2020 were $82.21and $34.91 per share, respectively. The Group recorded compensation expense related to the options of $ 19,951 and $ 15,718 for the nine months ended September 30, 2021 and 2020, respectively, which were classified in the accompanying unaudited condensed consolidated statements of operations as follows:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
|  | $ |  |  | $ |  |  | $ |  |  | $ |
Selling, general and administrative |  |  | 4,119 |  |  |  | 2,952 |  |  |  | 11,501 |  |  |  | 8,500 |
Research and development |  |  | 3,056 |  |  |  | 2,411 |  |  |  | 8,450 |  |  |  | 7,218 |
Total |  |  | 7,175 |  |  |  | 5,363 |  |  |  | 19,951 |  |  |  | 15,718 |
Allocation of compensation expense related to restricted shares | As of September 30, 2021, there was $46,885 of total unrecognized compensation expense related to non-vested restricted shares. The Group recorded compensation expense related to the restricted shares of $8,155 and $4,687 for the nine months ended September 30, 2021 and 2020, respectively, which were classified in the accompanying unaudited condensed consolidated statements of operations as follows:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
|  | $ |  |  | $ |  |  | $ |  |  | $ |
Selling, general and administrative |  |  | 2,028 |  |  |  | 1,065 |  |  |  | 5,078 |  |  |  | 3,179 |
Research and development |  |  | 1,353 |  |  |  | 550 |  |  |  | 3,077 |  |  |  | 1,508 |
Total |  |  | 3,381 |  |  |  | 1,615 |  |  |  | 8,155 |  |  |  | 4,687 |

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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=122041274&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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