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Stockholders' Equity - Preferred Stock (Details) | Sep. 30, 2021 $ / shares shares | Jun. 02, 2021 | Dec. 31, 2020 $ / shares shares
--- | --- | --- | ---
Preferred Stock |  |  |
Preferred stock, authorized (in shares) | 5,000,000 |  |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.001 |  |
Series X redeemable convertible preferred stock |  |  |
Preferred Stock |  |  |
Preferred stock, authorized (in shares) | 36,758 |  | 36,758
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.001 |  | $ 0.001
Preferred stock, outstanding (in shares) | 31,455 |  | 0
Number of common shares issuable upon conversion of preferred stock (in shares) | 5,242,501 |  |
Number of shares of common stock into which each share of Series X Preferred Stock may be converted | 166.67 | 166.67 |

X
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