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Common stock and common stock warrants (Details) $ / shares in Units, $ in Millions | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) Vote $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Jul. 19, 2021 shares
Common stock and common stock warrants |  |  |
Cash dividends | $ | $ 0.0 | $ 0.0 |
Shares reserved | 9,991,141 | 32,574,029 |
Common Class A |  |  |
Common stock and common stock warrants |  |  |
Common stock, authorized (in shares) | 210,000,000 | 35,000,000 | 210,000,000
Common stock, issued (in shares) | 34,449,154 | 612,850 |
Common stock, outstanding (in shares) | 34,449,154 | 612,850 |
Common stock, par value (in dollars per share) | $ / shares | $ 0.01 | $ 0.01 |
Number of votes | Vote | 1 |  |
Common Class B |  |  |
Common stock and common stock warrants |  |  |
Common stock, authorized (in shares) | 10,000,000 | 0 | 10,000,000
Common stock, issued (in shares) | 6,903,379 | 0 |
Common stock, outstanding (in shares) | 6,903,379 | 0 |
Common stock, par value (in dollars per share) | $ / shares | $ 0.01 | $ 0.01 |

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