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Capital Stock and Stockholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) vote $ / shares shares | Sep. 30, 2020 USD ($) | Dec. 31, 2020 $ / shares shares
Class of Stock [Line Items] |  |  |  |
Common stock, authorized (in shares) |  | 105,000,000 |  |
Preferred stock, authorized (in shares) |  | 5,000,000 |  | 5,000,000
Proceeds from return of profit | $ | $ 11,400 | $ 11,403 | $ 0 |
Class A common stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, authorized (in shares) |  | 94,000,000 |  | 94,000,000
Common stock, par value (usd per share) | $ / shares |  | $ 0.00001 |  | $ 0.00001
Voting rights (per share) | vote |  | 1 |  |
Class B common stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, authorized (in shares) |  | 6,000,000 |  | 6,000,000
Common stock, par value (usd per share) | $ / shares |  | $ 0.00001 |  | $ 0.00001
Voting rights (per share) | vote |  | 10 |  |

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