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Stockholders' Equity - Stock Split (Details) | Jun. 11, 2020 $ / shares shares | Sep. 30, 2021 $ / shares shares | Dec. 31, 2020 $ / shares shares
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Stockholders' Equity Note [Abstract] |  |  |
Reverse stock split ratio | 0.2 |  |
Common stock, par value (USD per share) | $ / shares | $ 0.0001 | $ 0.0001 | $ 0.0001
Common stock, authorized (in shares) | shares | 50,000,000 | 50,000,000 | 50,000,000

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