Business Combinations - Summary of Final Purchase Price Allocation (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Oct. 15, 2019
Business Acquisition [Line Items]
Goodwill	$ 241,121	$ 241,051
Orkus
Business Acquisition [Line Items]
Prepayments and other current assets			$ 34
Right-of-use assets			90
Goodwill			7,637
Intangible assets			9,760
Accounts payable			(21)
Accrued expenses and other liabilities			(133)
Deferred tax liability - non-current			(861)
Total fair value of assets acquired and liabilities assumed			16,506
Overwatch.ID
Business Acquisition [Line Items]
Cash and cash equivalents			45
Accounts receivable			66
Prepayments and other current assets			103
Deferred tax asset - non-current			687
Right-of-use assets			175
Goodwill			14,107
Intangible assets			6,610
Accounts payable			(256)
Accrued expenses and other liabilities			(185)
Deferred revenue			(466)
Total fair value of assets acquired and liabilities assumed			$ 20,886