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Commitments and Contingencies - Contingencies (Details) - USD ($) $ in Thousands			3 Months Ended
	Oct. 01, 2020	Feb. 28, 2020	Mar. 31, 2021	Mar. 31, 2020	Jan. 31, 2021	Dec. 31, 2020	Jun. 01, 2017
Commitments and Contingencies
Contingent purchase price paid			$ 0	$ 4,115
Total consideration			0	0
Recurring
Commitments and Contingencies
Contingent stock liability						$ 130,594
Level 3 | Recurring
Commitments and Contingencies
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Payment Earn Out Liability			0	(8,000)
Publons
Commitments and Contingencies
Additional payments to acquire business							$ 9,500
Contingent stock liability			0			0
Kopernio
Commitments and Contingencies
Additional payments to acquire business			0	$ 0
TrademarkVision
Commitments and Contingencies
Contingent stock liability			$ 0			$ 0
DRG
Commitments and Contingencies
Newly issued ordinary shares (in shares)			2,895,638
Decision Resources Group
Commitments and Contingencies
Additional payments to acquire business		$ 58,897	$ 86,029
Contingent stock liability		$ 58,897
Increase in contingent consideration			$ (24,410)
Newly issued ordinary shares (in shares)		2,895,638	2,895,638
Newly issued ordinary shares, value			$ 61,619
Total consideration		$ 964,997
CPA Global
Commitments and Contingencies
Contingent stock liability	$ 46,485
Newly issued ordinary shares (in shares)			1,500,000
Newly issued ordinary shares, value					$ 43,890
Total consideration	$ 8,643,561

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