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v3.19.1

Description of Business and Basis of Presentation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | Apr. 09, 2019 | Apr. 02, 2019 | Mar. 31, 2019 | Dec. 31, 2018
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Description Of Business And Basis Of Presentation [Line Items] |  |  |  |
Common stock shares authorized |  |  | 340,000,000 | 340,000,000
Common stock shares outstanding |  |  | 35,831,684 | 22,438,472
Subsequent Event |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |
Preferred stock shares authorized |  | 1,000,000,000 |  |
Subsequent Event | Co-founders |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |
Shares of common stock exchanged |  | 12,779,709 |  |
Class A Common Stock |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |
Offering costs |  |  | $ 7.7 |
Class A Common Stock | Subsequent Event |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |
Number of shares issued |  | 35,496,845 |  |
Underwriting discounts and commissions |  | $ 70.3 |  |
Common stock shares authorized |  | 18,000,000,000 |  |
Common stock shares outstanding |  | 255,007,393 |  |
Redeemable Convertible Preferred Stock | Subsequent Event |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |
Conversion of stock, shares converted |  | 219,175,709 |  |
Class B Common Stock | Subsequent Event |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |
Common stock shares authorized |  | 100,000,000 |  |
Common stock shares outstanding |  | 12,779,709 |  |
IPO | Class A Common Stock | Subsequent Event |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |
Number of shares issued |  | 32,500,000 |  |
Price per share |  | $ 72.00 |  |
Proceeds from issuance of common stock in initial public offering, net of issuance costs |  | $ 2,500.0 |  |
Exercise by Underwriters' Option to Purchase Additional Shares | Class A Common Stock | Subsequent Event |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |
Number of shares issued | 2,996,845 |  |  |
Price per share | $ 72.00 |  |  |

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