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Description of Business and Summary of Significant Accounting Policies - Initial and Follow-On Public Offering (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 17, 2020 | Sep. 25, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Payments of expenses associated with initial public offering |  |  | $ 0 | $ 1,373 | $ 0
Proceeds from issuance of common stock |  |  | 0 | 58,349 | 4,510
Public Stock Offering - Shares From Existing Shareholders |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Payments of expenses associated with initial public offering |  |  |  | 26,130 |
Follow-On Offering |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Proceeds from issuance of common stock |  |  | $ 0 | 295,802 | $ 0
Expenses associated with sale of stock |  |  |  | $ 12,898 |
Class B Common Stock | Public Stock Offering - Shares From Existing Shareholders |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Number of shares sold (in shares) |  | 12,360,991 |  |  |
Price per share sold (USD per share) |  | $ 22.00 |  |  |
Class B Common Stock | Follow-On Offering |  |  |  |  |
Subsidiary, Sale 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 |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Number of shares sold (in shares) | 9,603,965 |  |  |  |
Class B Common Stock | Follow-On Offering, Exercise By Underwriters |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Number of shares sold (in shares) | 1,500,000 |  |  |  |
Class B Common Stock | Follow-On Offering, Shares From Existing Shareholders |  |  |  |  |
Subsidiary, Sale 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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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
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