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Share-based payment (Details) - Schedule non-vested shares activity - $ / shares | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Non-Vested Share [Member] |  |  |
Share-based payment (Details) - Schedule non-vested shares activity [Line Items] |  |  |
Weighted average grant date fair value per share, outstanding at beginning |  | $ 182.13 | $ 182.13
Weighted average grant date fair value per share, transfer from non-vested shares |  | 182.13 |
Weighted average grant date fair value per share, outstanding at ending |  |  |
Weighted average grant date fair value per share, Outstanding as of June 30, 2020 |  |  |
Non-Vested Share [Member] | Non-vested share [Member] |  |  |
Share-based payment (Details) - Schedule non-vested shares activity [Line Items] |  |  |
Number of non-vested shares, outstanding at beginning |  | 20,523 | 20,523
Number of non-vested shares, transfer from non-vested shares |  | (20,523) |
Number of non-vested shares, outstanding at ending |  |  |
Number of non-vested shares, Outstanding as of June 30, 2020 |  |  |
Non-Vested Share Units [Member] |  |  |
Share-based payment (Details) - Schedule non-vested shares activity [Line Items] |  |  |
Weighted average grant date fair value per share, outstanding at beginning | $ 149.10 | $ 143.89 | $ 143.89
Weighted average grant date fair value per share, forfeited |  | 227.24 |
Weighted average grant date fair value per share, transfer from non-vested shares |  | 182.13 |
Weighted average grant date fair value per share, outstanding at ending | $ 149.10 | 149.10 | $ 149.10
Weighted average grant date fair value per share, Outstanding as of June 30, 2020 |  | $ 149.10 |
Non-Vested Share Units [Member] | Non-vested share [Member] |  |  |
Share-based payment (Details) - Schedule non-vested shares activity [Line Items] |  |  |
Number of non-vested shares, outstanding at beginning | 143,652 | 123,575 | 123,575
Number of non-vested shares, forfeited |  | (446) |
Number of non-vested shares, transfer from non-vested shares |  | 20,523 |
Number of non-vested shares, outstanding at ending | 143,652 | 143,652 | 143,652
Number of non-vested shares, Outstanding as of June 30, 2020 |  | 143,652 |

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- Definition Number of non-vested shares, outstanding . + References No definition available. + Details
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- Definition Weighted average grant date fair value per share, outstanding. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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 (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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