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Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	Apr. 11, 2018	Dec. 31, 2018
Proceeds forgone upon exercise of stock options on a cashless basis		$ 508
Acquisition Of Etfs Business [Member]
Non-cash consideration transferred	$ 270,000
Deferred consideration	$ 172,746
Common Stock [Member]
Business acquisition, number of shares to be issued	15,250,000
Series A Non-Voting Convertible Preferred Stock [Member] | Acquisition Of Etfs Business [Member]
Business acquisition, number of shares to be issued	14,750

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