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Deferred Revenue (Details) - Tradeweb Markets LLC - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Successor |  |  |
Changes in deferred revenue |  |  |
Deferred revenue balance - beginning of period | $ 28,280 |  |
New billings | 26,609 |  |
Revenue recognized | (27,006) |  |
Deferred revenue balance - end of period | 27,883 | $ 28,280 |
Predecessor |  |  |
Changes in deferred revenue |  |  |
Deferred revenue balance - beginning of period | $ 28,280 | 29,673 | $ 42,184
New billings |  | 100,091 | 127,312
Revenue recognized |  | (101,484) | (139,823)
Deferred revenue balance - end of period |  | $ 28,280 | $ 29,673

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- Details
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