Stockholders' Equity - Narrative (Details) shares in Thousands |
Sep. 30, 2021
vote
shares
|
Dec. 31, 2020
shares
|
---|---|---|
Class A Common Stock | ||
Class of Stock [Line Items] | ||
Common stock shares outstanding (in shares) | shares | 19,786 | 18,304 |
Vote per share (in votes) | vote | 1 | |
Class B Common Stock | ||
Class of Stock [Line Items] | ||
Common stock shares outstanding (in shares) | shares | 17,239 | 18,447 |
Vote per share (in votes) | vote | 1 |