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Stockholders' Equity - Preferred Stock (Details) - $ / shares | Jun. 30, 2021 | Dec. 31, 2020
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Preferred Stock |  |
Preferred stock, authorized (in shares) | 5,000,000 |
Preferred stock, par value (in dollars per share) | $ 0.001 |
Series X redeemable convertible preferred stock |  |
Preferred Stock |  |
Preferred stock, authorized (in shares) | 37,848 |
Preferred stock, par value (in dollars per share) | $ 0.001 |
Preferred stock, outstanding (in shares) | 32,545 | 0

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