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Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands | Apr. 11, 2018 | Dec. 31, 2018
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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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