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Summary of Significant Accounting Policies (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Concentration Risk [Line Items] |  |  |  |
Marketing promotions and discounts , as a reduction of revenue |  | $ 51,300,000 | $ 27,700,000 | $ 11,600,000
Marketing promotions and discounts , as sales and marketing expense |  | 91,500,000 | 45,200,000 | 18,700,000
Advertising expenses |  | 136,800,000 | 53,500,000 | 25,300,000
Redeemable convertible preferred stock redemption | $ 866,000,000 |  | $ 62,500,000 | $ 18,800,000
Letter of credit |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Restricted cash is comprised of $2.9 million which is pledged in the form of a letter of credit for the Company's new headquarters in San Francisco |  | $ 2,900,000 |  |
Revenue | Developer partners |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Number of developer partners |  | 2 | 2 | 2
Revenue | Developer partner one |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage of revenue |  | 59.00% | 83.00% | 70.00%
Revenue | Developer partner two |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage of revenue |  | 28.00% | 7.00% | 16.00%

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