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Common Stock - Class B common stock (Details) - Class B Common Stock | 12 Months Ended
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Dec. 31, 2021 Vote $ / shares shares | Dec. 31, 2020 Vote $ / shares shares
Class of Stock [Line Items] |  |
Common stock, shares authorized (in shares) | 20,000,000 | 6,032,183
Common stock, par value per share (in dollars per share) | $ / shares | $ 0.001 | $ 0.001
Common stock, shares issued (in shares) | 0 | 0
Common stock, shares outstanding (in shares) | 0 | 0
Number of votes | Vote | 0 | 0

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