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Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Jun. 20, 2017
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
Convertible Preferred Stock [Member] | Thesys Group, Inc [Member] | Series Y Preferred Stock [Member]
Fair value of preferred stock		$ 6,909

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