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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

X

- 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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X

- Definition

Schedule of lease impairment charges.

+ References

No definition available.

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