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Leases - Summary of lease impairment charges (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Schedule of lease impairment charges [Line Items] |  |  |  |
Operating lease, impairment loss | $ 9,277 |  | $ 9,580 |
New York Office [Member] |  |  |  |
Schedule of lease impairment charges [Line Items] |  |  |  |
Operating lease, impairment loss | 9,277 |  | 9,277 |
London Office [Member] |  |  |  |
Schedule of lease impairment charges [Line Items] |  |  |  |
Operating lease, impairment loss |  |  | $ 303 |

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- Definition Amount of loss from impairment of right-of-use asset from operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 25 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123399704&loc=SL77918431-209957 + Details
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- Definition Schedule of lease impairment charges. + References No definition available. + Details
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- Details
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