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Condensed Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 19, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Reversal of stock based compensation expense |  | $ 23.8 |  |  |  |
Reversal of stock based compensation expense previously recognized |  | $ 21.5 |  |  |  |
Cost of revenue |  |  |  |  |  |
Allocated share-based compensation expense |  |  | $ 4.5 | $ 4.7 | $ 8.0 | $ 7.7
Research and development |  |  |  |  |  |
Allocated share-based compensation expense |  |  | 47.0 | 37.7 | 84.2 | 68.2
Sales and marketing |  |  |  |  |  |
Allocated share-based compensation expense |  |  | 9.5 | 8.8 | 16.2 | 15.9
General and administrative |  |  |  |  |  |
Allocated share-based compensation expense | [1] |  | $ 15.6 | $ 16.9 | $ 8.0 | $ 31.9
[1] | On March 19, 2020, one of the Company's co-founders resigned as a member of the board and as an officer of the Company, resulting in the reversal of $23.8 million in stock-based compensation expense. Of the total amount reversed, $21.5 million related to expense recognized prior to December 31, 2019. See Note 12 "Stockholders' Equity" for further information.

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