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Common Stock - Follow-On Public Offering Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Nov. 17, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Follow-On Offering |  |  |  |
Class of Stock [Line Items] |  |  |  |
Proceeds from issuance of common stock |  | $ 295,802 | $ 0 | $ 0
Expenses associated with sale of stock |  | $ 12,898 |  |
Class B Common Stock | Follow-On Offering |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of shares sold (in shares) | 11,500,000 |  |  |
Price per share sold (USD per share) | $ 32.00 |  |  |
Class B Common Stock | Follow-On Offering, Sold By Company |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of shares sold (in shares) | 9,603,965 |  |  |
Class B Common Stock | Follow-On Offering, Exercise By Underwriters |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of shares sold (in shares) | 1,500,000 |  |  |
Class B Common Stock | Follow-On Offering, Shares From Existing Shareholders |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of shares sold (in shares) | 1,896,035 |  |  |
Proceeds from issuance of common stock | $ 294,429 |  |  |
Expenses associated with sale of stock | $ 12,898 |  |  |

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