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Redeemable Convertible Preferred Stock and Common Stock - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 21, 2020 | Feb. 14, 2020 | Dec. 11, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 07, 2018 | Feb. 28, 2018
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  | 1,600,000,000 | 1,600,000,000 | 1,600,000,000 |  |  | 775,000,000
Redeemable convertible preferred stock, shares authorized |  |  |  |  |  |  | 509,352,795 |
Common stock, par value (usd per share) |  |  | $ 0.0001 | $ 0.0001 | $ 0.0001 |  |  |
Preferred stock, shares authorized (in shares) |  |  | 162,000,000 | 162,000,000 | 162,000,000 |  |  |
Preferred stock, par value (usd per share) |  |  | $ 0.0001 | $ 0.0001 | $ 0.0001 |  |  |
Shares of common stock issued (in shares) | 17,600,000 | 30,263,158 |  |  |  |  |  |
Price per share (usd per share) | $ 76.00 | $ 19.00 |  |  |  |  |  |
Offering expenses |  |  |  | $ 2,120 |  | $ 41,322 |  |
Redeemable convertible preferred stock, shares issued |  |  |  | 0 | 0 |  |  |
Redeemable convertible preferred stock, shares outstanding |  |  |  | 0 | 0 |  |  |
Proceeds from public offering |  |  |  | $ 1,852,725 | $ 0 | $ 563,026 |  |
IPO |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Shares of common stock issued (in shares) |  |  | 26,275,993 |  |  |  |  |
Price per share (usd per share) |  |  | $ 23.00 |  |  |  |  |
Underwriting discounts |  |  | $ 33,200 |  |  |  |  |
Offering expenses |  |  | 8,100 |  |  |  |  |
Proceeds from public offering |  |  | $ 563,000 |  |  |  |  |
IPO | Common Stock |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock converted into common stock (in shares) |  |  | 236,012,913 |  |  |  |  |
Public Equity Offering |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Shares of common stock issued (in shares) | 17,600,000 | 26,315,790 |  |  |  |  |  |
Price per share (usd per share) | $ 76.00 | $ 19.00 |  |  |  |  |  |
Proceeds from public offering | $ 1,300,000 | $ 477,700 |  |  |  |  |  |
Underwriting Option |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Shares of common stock issued (in shares) |  | 3,947,368 |  |  |  |  |  |
Proceeds from public offering |  | $ 71,800 |  |  |  |  |  |

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