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Common Stock- Global Employee Stock Purchase Plan (Details) - USD ($) $ in Thousands |  | 9 Months Ended |
--- | --- | --- | ---
Sep. 22, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Class of Stock [Line Items] |  |  |  |
Net proceeds received |  | $ 0 | $ 58,349 |
Employee stock purchase plan contributions |  | $ 2,589 |  | $ 0
ESPP |  |  |  |
Class of Stock [Line Items] |  |  |  |
Maximum percent of eligible compensation available to contribute | 15.00% |  |  |
Maximum employee annual contribution amount | $ 25 |  |  |
Purchase price of common stock, percent | 85.00% |  |  |
Class B Common Stock | ESPP |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares reserved for future issuance (in shares) | 25,000,000 |  |  |
Shares issued (in shares) |  | 104,716 |  |
Net proceeds received |  | $ 3,845 |  |
Shares purchased (in shares) |  | 111,486 |  |
Shares sold back (in shares) |  | 6,770 |  |
Share-based compensation tax withholding payment |  | $ 438 |  |

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