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Overview and Basis of Presentation (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 23, 2021 | Mar. 29, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Issuance costs |  |  |  |  | $ 0 | $ 658 | $ 1,600 | $ 0
Common Class A |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Issuance costs |  |  | $ 825 | $ 13,378 |  |  |  |
Number of shares issued in conversion (in shares) |  |  |  |  | 1 |  |  |
Common Class B |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares issued in conversion (in shares) |  |  |  |  | 1 |  |  |
IPO | Common Class A |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Stock sold (in shares) |  | 10,000,000 |  |  |  |  |  |
Price per share (in USD per share) |  | $ 14.00 |  |  |  |  |  |
Net proceeds |  | $ 126,600 |  |  |  |  |  |
Issuance costs |  | $ 13,400 |  |  |  |  |  |
Underwriters' option | Common Class A |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Stock sold (in shares) | 719,266 |  |  |  |  |  |  |
Net proceeds | $ 9,200 |  |  |  |  |  |  |
Issuance costs | $ 800 |  |  |  |  |  |  |

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