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Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jun. 20, 2017
Proceeds forgone upon exercise of stock options on a cashless basis |  | $ 508 |
Right of use asset | $ 18,161 |  |
Operating lease liabilities | 22,739 |  |
Acquisition Of Etfs Business [Member] |  |  |
Non-cash consideration transferred | $ 270,000 |  |
Common Stock [Member] |  |  |
Business acquisition, number of shares to be issued | 15,250,000 |  |
Convertible Preferred Stock [Member] | Thesys Group, Inc [Member] | Series Y Preferred Stock [Member] |  |  |
Fair value of preferred stock |  | $ 3,080 | $ 6,909

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